Richard231, you're not exactly right in claiming that there haven't been attacks on Muslims in Europe.  There have been hundreds. But let's accept that it's partially true since there have been no fatal attacks in Europe that I know of. 
The problem though is that there have been hundreds of  thousands of Muslims killed in their homelands in wars largely started through interference by Western nations in Iraq, Libya, Afghanistan, etc. You may argue that these wars were justified, but if you were the one whose families and friends were killed as a result of these wars, you might think differently. Violence begets violence,  unfortunately but inevitably.The terrorists believe that they are fighting a war against the people who attacked them in their own countries. 
No, I'm not in any way trying to justify terrorist attacks. I find them  horrible and disgusting,  
But you should understand why they do it. Understanding the reasons why is the best way to stop them before they happen.