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a vegan diet is the most ethically viable
But you aren't staying on point. You were just talking about what is "better" for our large societies. Survival. If we take better care of our habitat then we are helping to better ensure our survival.
It is important to fund manned space flight
But this doesn't address the issue. Besides, politics and jails are necessary institutions at this point. You would need to propose a solution to these established processes that saves us the resources to put toward space exploration.
We should stop working on Artificial Intelligence
This depends on how you define "superior to us in every way". We don't know what an AI (capable of destroying humanity) will look like yet.