Will France eventually lose most of their tourism due to their terrorism problem?
They will lose some, but they are still the most popular tourist destination in the world and streets ahead of the UK. The probabiliyu of being involved in a terrorist incident is still very low.
Sigh, I just don't see why countries value refugees and having mass multiculturalism over the safety of their own citizens.
People feel guilty about having first-world problems and being better off than the Middle East and Africa, so they want to let those people in until they have third-world problems and their countries suck too, so that they don't have to feel bad anymore. Also some weird mystical woo-woo stuff about karma that's mostly used as a justification for the above attitude.