The trouble with extremists is that quite often they are the ones that refuse to listen to reason and respect other peoples point of view, If you cant change peoples opinion with reasoned debate, wit and logic then-

a. your argument doesnt hold water
b. agree to disagree like gentleman/women

however because not everyone is reasonable, there are times when direct action is appropriate. history tells us that.

things like culls animal cruelty etc are always going to cause upset, however often its the way in which things are carried out rather than then end result that causes offence.