Earlier quoted context omitted.
It sounds like you are trying to use the foot-in-the-door technique. But you are looking at just one concern being very hypothetically alleviated, when there are many many other reasons that have been repeatedly discussed for years. So in practice, the answer to your question is no, and there is no reasonably considered theory where the answer would be yes.
I agree with you wholeheartedly. The risk of saying "we shouldn't do this because it won't work" is that it only has to work a little bit for the argument against it to fail. And it will certainly work a little bit at reducing one type of terrorism, just not enough to outweigh all the other negative effects. That said, I would also like to see more discussion of alternatives instead of just saying "it'll never work".
Some hypothetical approaches for discussion:
- Convincing violent groups to be less violent; demonstrating that they can get more of what they want by participating in society than by attacking it (a multi-generational issue)
- Finding a place for the "lone wolf" types to feel like their needs and concerns are addressed, including mental health
- Getting first-world powers to stop purposely destabilizing other countries
- Accepting what remains of the problem as if it's a natural disaster (e.g. just as people accept or ignore the 1000x worse problem of traffic deaths)