There are measures in place and it has nothing, literally nothing to do with PC or them feels.
The incompetence of European intelligence services are getting hilarious. Instead of blaming immigrants and minorities for these incidents, you should understand there are always nut jobs in all communities, if you can't force your security agencies to take things seriously and stop being incompetent, even if you throw all the minorities out, extremists will abuse mentally unstable natives for their evil deeds.