I eat meat and try to reduce my consumption because I recognize industrial meat production is wasteful, causes needed suffering, and has a big ecological footprint.

Who cares about vegans if modern society fails apocalyptically? I'd rather work to prevent such an event and a huge part of the population would be doomed regardless of their diet. I salute those putting in the extra effort to be fully vegetarian/vegan even if I don't quite agree with some of their extremist militantism.

Our efforts would likely be better placed encouraging more people to reduce their meat consumption. It's a more realistic goal and can have a big impact.