Why is there such stigma around criticizing Islam in the west?

The reason I say this is because something that happened in my city recently, an Islamist radical registered terrorist organization in 3 country’s was allowed to speak in my city. You can’t criticize this decision and it let me to ask myself why? I mean I’m a Christian but I have way softer views than most, but this just seems weird, like are we really trying that hard to be inclusive? Why is it such a taboo thing to criticize? Why am I called islamaphobic if I do so? I have been called many names and have been critiqued as a Christian in many spaces, but I’ve never seen the same done with Muslims, why? It’s okay to critique me and Christianity and I know and understand why you do it, but why can’t the same be done with Islam, what’s the issue? Can someone fill me in on this?