It is definitely a necessary question to ask. You need to have a prediction of how effective your solutions will be. You also need predictions of how practical they are, and it may be that something very effective is not practical -- e.g. banning Islam. You could make a list of things you should ask: how efficient, effective, sustainable, scalable, etc. But effective certainly has a place on the list.
Banning religions in general is no effective move if you have a different goal than radicalising people. Christianity grew in the Roman empire at a time where being a Christian was punishable by death.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.