Well, Shia has some bad subsets, the same way that Sunni Islam has bad subsets. The thing is, people are taking the negative aspects of shia as a whole and comparing it with a truly fucked subset of Sunni. It isn't an accurate comparison. Not even close. I mean majority of shia Muslims are peace loving normal people just as majority of sunnis are peace loving normal people! Salafism by the sole virtue of its ideas is very militant, truly fucked up ideology!
Like any group of people, Salafis are not a monolith.
Read these paragraphs above and see that even in Salafism, the sect that you so apparently detest, jihadists are a very small minority. Saying all Salafists are terrorists is just as ignorant as saying all Muslims are terrorists.