Yes, and you're making the same mistake that you're railing against: if you're going to invoke some sort of moral imperative to do something, you have to examine the risk of what can happen if you do nothing. In the case of something like Heartbleed, yes, the consequences of silence could be quite high. But I just can't see the same argument against remaining silent for this web framework.

It's also a matter of degree and thoroughness. There's a huge difference between "I've found a specific exploitable vulnerability in this security library and here is a proof-of-concept exploit", and "after a cursory look, I see this rust code uses a lot of `unsafe` and I'm uncomfortable with that".