The survival of the fittest narrative was debunked almost as soon as it existed, and that debunking is what forms the ideological basis of mutual aid. That people continue to spread this toxic misinformation over a century later is a testament to the unfortunate tenacity of lies.
Even in the most brutal depths of the natural world, cooperation is still the overarching basis of ecosystem health. It's known in Permaculture, for instance, that too much competition results in resource depletions.
A vegan ethic is inline with a growing awareness and need for us all to learn to expand our capacities of empathy and compassion, from those who are most like us, to those who are most unlike us.
On the topic of wilderness areas, vegans are divided on what the right approaches are. Some of us compare natural biomes to sovereign nations - while we dislike the harms that occur in those places, we feel a need to allow other species their independence to have their self-determination, if for no other reason than the fact that nature is the basis of maintaining a habitable planet, and interference in ecosystems should only be done with the utmost care.
But there are other vegans who do believe strongly that we should be intervening in wild places as well, with the goals of eliminating predation all together, and managing wildlife populations in more ethical ways.
It's a highly contentious topic to be honest.