Vegans/animal rights/anti-hunting activists have some of the most fucked up individuals in their ranks who would not bat an eye to commit wholesale terrorist attacks if they could hatch and assemble a plan. There is a reason why the plots of many zombie and contagion outbreak movies feature animal rights extremists breaking into pharmaceutical and disease research facilities to destroy stuff and intentionally or accidentally release something deadly into the population. These plots are believable as instances of such actions HAS happened in real life.