I believe that NASA should have it's budget increased for moral and ethical reasons.
1)In Genesis, God revealed to humanity that they should, Be fruitful and multiply and fill the earth and subdue it and have dominion over the fish of the sea and over the birds of the heavens and over every living thing that moves on the earth. Many other religions have similar beliefs as expressed in their holy texts, practices and beliefs. Even to the nonbeliever, this is an essential truth: through our endevours, industrious nature and hunger for resources, we have expanded and now hold the ultimate fate of the planet in our hands.
If we wish to avoid draining the life of our homeworld, we need to take care of it - this is an essential part of dominion over nature. But before you can take care of something, before you can fix a problem, you need to understand it. NASA is in an excellent position to do this through research and exploration.
Whether or not they are launching satellites to study the atmosphere, placing sensors on tectonic plate boundaries, or furthering our understanding of the particle physics that determine the climate, NASA first and foremost is giving us the knowledge we need to tackle many of the issues the Earth faces; be they pollution, global warming, the spread of invasives species and others.
We can see the writing on the wall - there are factors both inside and outside of our control that cause problems for life on Earth. We can see the writing, but we'll never decipher it without adequate budgets for research and innovative solutions. This is why NASA needs more funding, they are in a unique postition to figure out the problems and work to correct them.
2)Somewhere in the vast, unknowable void is an asteroid with a tatoo that reads, 'I pwn planets'. A cousin to this asteroid wiped out the dinosaurs, and countless others have rained hellfire and damnation on the defenseless creatures of our planet. It's only a matter of time before this asteroid pays us a visit and makes good on the claim scrawled in ink on it's rocky surface.
We know this has happened before, and it will happen again. Just over 100 years ago, a comet exploded over Tunguska, Russia and leveled hundreds of square miles of forest. The resulting fires turned night to day as far away as London as this nightmare from outer space paid death and destruction to a large part of the ecosystem where it hit.
On this chance happening, humanity was lucky that it hit an unpopulated area. But we simply cannot count on luck, especially when we have it within our means to find menacing asteroids and correct their trajectories.
NASA is currently searching for (and has found) many asteroids and comets that cross Earth's path, but the deflection part of the task is difficult. We need to increase the budget of NASA so that it can carry out this mission.
We are the product of billions of years of evolution, and as far as we know, we are the only intelligent beings there is. We have a mandate to protect and preserve life on this planet, as well as our own. To do so will not only damn us to extinction, but could snuff out the existence of life itself in the Universe.
3)Inter-governmental agencies are not capable of fufilling the task of preserving life on Earth. We must expedite research and development at NASA to meet the task of combating climate change, pollution and asteroidal impacts, among other threats.
Currently, the UN is incapable of protecting the citizens of certain countries from extermination at the hands of other people. How can we trust that the international community will pull together to deal with existential problems of orders of magnitude more difficulty?
4)Even if international cooperation realize that it is a moral and ethical imperative to tackle such problems, we must give more funding to NASA. For one, NASA will be the major US governmental agency to deal with a problem like an asteroidal impact, so it will be funded more even in the case of international cooperation.
For another, not giving NASA enough funds now only stunts our ability to deal with problem and others. Waiting until we see the train coming down the tracks to find a way to derail it before impact is folly. We must find the coming train in the darkness of space and start working to derail it now.
5)There is no other life of any kind in the universe as far as we know. As the only agent of intelligence, we must ensure the survival of life. To do this not only requires protecting it, we must grant life safe harbor on other worlds.
We must scour our solar system for environments to bend to the will of life. We must push life further and further afield so that it can never again be hostage to mere chance.
This is a massive undertaking, we are only now unlocking the secrets of genetics or planetary eco-engineering. We must make haste to push the boundary of science in this direction so that we can take life whereever we see fit, we must show favor to God's most awesome creation - life - and extend it's reach and place it in an unassailable position.
We need to start that work now, by further funding NASA to work towards this goal, before the bright flame of genetic creativity and energy is extinguished by our own misdeeds or the turning of fortune.
God gave us brains and a mandate to protect his creation. It's time we do it, and NASA is in a unique position to be the seed spreader and protector of the future of that creation.