That's a really interesting way to put it. I definitely am guilty of reacting to hypocrisy by being more and more biased towards nihilism.
If you view life and technology as evolving toward increasing complexity and power as time goes on, then morally we have the opportunity to evolve as well. We can steady state for a while at our current moral development (which is probably more egalitarian than morality was just a few hundred years ago), or we can alter our morality as life and technology advances. Given enough time, technology may become indistinguishable from the old-school gods, so morally the question becomes, are we going to become gods with all-too-human morality, with god-like love, or with demon-like selfishness?
Biasing towards nihilism is picking the demonic route.
Now you made it sound attractive tho
It's one thing to point out hypocrisy about the suffering that the meat industry causes as a way to encourage people to think about whether it's necessary for them to eat meat. It's another thing to point out the hypocrisy around the meat industry as a way to say "so therefore you also shouldn't care about animal testing." That's going backwards, not forwards.
You are all allowed to care about lab animals even if you eat meat, I give you my... I don't know, my "vegan blessing" or whatever. Also, you don't need the vegan movement's permission to care about animals anyway, but whatever.
The point is, try to be kind to animals when you can be. And if you want to be more consistent, be more consistently kind, not more consistently cruel.