The libertarian philosophy has a lot of components that are internally consistent. Starting with a premise that people are owed maximum sustainable liberty is
fine, even if you don't agree with each aggregate consequence. They just don't have solutions for some real world applications. All property rights can trace at least part of its origin to original theft. This isn't something anybody can fix, obviously, but it does mean that modern property rights are all stained with a taint of illegitimacy.
So, insisting that all modern property rights
must be protected just outright fails. The error isn't even in the current allocation of property rights, because the world is full of errors and we do our best to fix them. The error is in insisting they shouldn't be fixed.
Even the side argument, of "can they even be fixed?" is a legitimate question, because it's hella hard to answer and deserves attention. But the side-argument
needs to contain the understanding that you
are looking for fixes - even if they're iterative or imperfect.
Libertarianism also suffers from other practical considerations. It's never been successfully adopted at scale with migration as evidence of buy-in. And libertarians don't don't defend themselves from external threats so that they're not free-riders. So, it's just an idea, a place to start thinking from. I come from pretty strong Libertarian tendencies, and I mostly gave up on them when they couldn't even use their own solution for climate change. The Ebola crisis then just completely lost me as much as the Evangelicals lost my respect due to Trump.
I haven't literally endorsed a system that allows cops to 'accidentally' kill people (WTH).
Naw, you have. You think that the cops should have greater leeway for creating scenarios for when they 'plausibly' have to defend themselves. They have greater permission to create the risk but the same burden to be free of criminal consequences.
No citizen could have arranged Philandro Castile's death like that and walked away 'not guilty'. Only an agent of the state could have, and did. A cop is allowed to accidentally kill someone in a way citizens aren't. And that means "accidentally" is easier as well, by default.