I think federal prison is a little heavy handed. A better sentence for him would have him clean the cages for a few weeks.
It needs to be put in context with the terrorist acts committed by PETA and others. Known for their ignorant, ham handed and violent behavior, in places like the UK, they have attacked people in horrible ways, like exhuming their dead family members. They also engage in arson, robbery and vandalism, and use doxxing to personally attack people they hate.
They need to be prosecuted to the full extent of the law.