Falsification:
But yes, true until proven otherwise certainly is the gist of it.
I also disagree. (Strongly.)
Religion is a good example.
The significant claims about God, for example, are not falsifiable. So they're a bad, bad,
bad subject for any positivism-based investigation. However, that does not mean we should assume they're true until proven wrong.
And, remember, they *can't* be proven wrong! That's the point - they aren't falsifiable.
A simple example would be the contention that invisible, immaterial 30-foot tall unicorns roam the woods behind my house eating racoons*. It's not falsifiable, but I don't think there's any reason to assume it's true until proven otherwise.
What falsification does is provide a constructive way forward. When someone makes a falsifiable claim you aren't stuck criticizing their moral choices because they're the best available target for criticism. Instead, you can go try to falsify their claim rather than simply arguing.
That's the constructive response.
It's why it's so important to distinguish between simple claims of fact and other claims. Claims about facts can be falsified. Lots of arguments fall astray here. Especially political ones, where the facts that are the basis of the argument are from sensational news reports and,
in fact, false.
The concept is important in experiment design (going back to science) because an experiment that
cannot fail is a experiment that can't prove someone's claim either. The experiment will show some level of success no matter what.
The existence of an experiment so poorly designed it cannot fail shouldn't, in itself, motivate you to assume a claim is true until a better experiment comes along. But, with regard to angonism, what you can do is point out the lack of falsification and then shut up. You do have the option of assuming the claim
might be true.
*
"If they're eating the racoons, why wasn't there a dip in the raccoon population?"
"Because there would have been more racoons otherwise."
"Then what about the racoon population here being on par with raccoon populations elsewhere."
"You've just demonstrated the unicorns are widespread!"
That's an "immunization strategy." It's the elaborations people put around unfalsifiable ideas to keep them unfalsifiable.