None of those bands have been relavent in hardcore (other than on the fringe) in 20+ years. I've been involved in the punk/hardcore scene since the mid-nineties (and vegan since 2002) and while the scene is a little more veg friendly then most, a majority of the punk/hardcore kids i've grown up with and know are meat eaters.
as for the internet - it's full of opinionated zealots no matter what the cause.