If depends on where you place your morals.
Human morals are antropocentric. The only reason we see "life" as something good is because we are descendants of people who saw "life" as someting good, it's in our genes, our instinct of survival. Our ancestors would have killed themselves without that instinctive attachment to life, so we wouldn't have been born in the first place. It's selection bias... natural selection.
The Earth, and the Universe in general, does not care about life (human or otherwise), or about suffering, or about apetite. The planets will continue to be there long after we are extinct. We (including the animals around us) and our feelings have zero "importance" in reality. There's no real importance scale but the one we make.
Humans categorize things in "importance" based on how they serve the human race. Even something like global warming, is important in so far as it puts humanity lives at risk, no other reason. It's not about "saving Earth" or the animals, it's about saving ourselves. We are the "important" ones, in our own view. If you don't agree with this then... why not advocate for a safe way to end ourselves without suffering? wouldn't the Earth be "better" without humanity? if the goal was really about minimizing suffering, that might be a good approach wouldn't it?
Note that I'm NOT advocating for suicide... but trying to show the argument is not that good.
I can understand vegans that do it for the future of the Earth (and humanity) and to fight our own autodestructive behavior. And I totally support that, I think it makes complete sense and it's what got me interested in this as well. But I don't understand those who first and foremost put the focus on the animal suffering. I feel that's more of an appeal to empathy (another evolutionary trait) and it's driven by emotion/instincts rather than logic/reason. The argument being made this way is more of an emotional blackmailing trying to make our reptile brain feel bad, not about giving an actual logical argument.