The whole "offending Muslims" thing is a non-issue, only propagated by those who seek to make it an issue. As a muslim myself and most of the people I know, we aren't even offended by comments people make towards Islam after such terrorist events. We are far more offended by these animals carrying out killing of innocents in they name of our religion. The only other thing I am personally annoyed by is people who expect us to do something about this, like we have some special power of persuasion that non-muslims do not have.
Thankfully I think more and more people are realising that IS and other groups like them are law unto themselves. They are far less to do with religion and more to do with an ideology born out of political turmoil.
I do agree that more needs to be done in terms of who we let into this country.