This boils down to a single thing...
If you have many muslims in your country you live in a surveillance state.
And this is a massive slippery slope
When the next atrocity happens the government will claim they need even more powers to stop the next one.
Watch out what will happen in France in the next 4-6 years it is an indication of what happens in the rest of Europe.
Before you jump on your chair, answer this, what problem is there that requires the government to spy on the entire population? The "cosa nostra"? The IRA? ETA? The Red Brigades? the Nazi party?
And then think about this, if next government is a despotic government they will have a fantastic infrastructure to use for repression of dissenting individuals. Consider before you dismiss all of this as nonsense that a non-despotic government has already been prosecuting people for posting the wrong opinion on social media...
How long until we can not express the wrong thoughts in places like this?