I’m aware healthy dry food contains meat. It’s fundamentally necessary for cats. I could understand vegans not wanting raw or preserved meat in their house, and I think having dry food would be an easy compromise for most vegans, but the ones who are very loving of their pet companions would keep wet food and meat treats for their cats despite it.
Quite frankly if a vegan is so bad at research that they don’t know cats need meat, I doubt they’d realize that dry food contains meat, and vice versa.
I think you are assuming something worse to be needlessly angry. I think you have an implicit bias that most vegans are idiots and that’s lead you to your assumption.