Not all Muslims that are like that. It's actually just a small subset of an even smaller subset that are violent. And of course the violent groups shouldn't be tolerated...but it is important to make that distinction, otherwise you end up being just as blindly intolerant as the fanatics.
It's not a small subset. It's a small subset which carry out the violence, but several studies have shown muslims to support violence and even terrorism against unbelievers or those who insult Islam. The idea that Islam is generally peaceful is a lie and the greatest danger in recognizing the threat from Islam.
Islam has been at war with Europe for more than a 1000 years and almost conquered Europe only 500 years ago. Historically the only time Europe didn't fight Islam was during the cold war. Islam is our arch-nemesis and we need to fight and win.