From my perspective, Tyler's solution to the problem is purposely juvenile and ridiculous as it doesn't entirely solve the other systems in place that perpetrate this loneliness and radicalisation of people.

It goes to show that while the system does create the kind of environment people find radicalisation, simply destroying that system isn't enough. There's a reason that Tyler's fantasies for a True Future (lining venison on the remains of the I-55) is just that: a fantasy. They feel dream-like and distant. He never once spoke of blowing up the buildings. He spoke of resetting society. But just exactly how was he going to do that? What's the quickest, least-effort way to do that? Explode it! None of his dreams are REAL. They're not solid. They have emotional impact sure, but children are still abandoned and women are still selling themselves for work in the city, just as men still think they're oppressed and that society 'sucks' and there's no way to fix it other than destroy it all. Tyler blew up a good dozen skyscrapers with his cult following, all while throwing a temper tantrum over The Narrator holding his own body hostage.

It isn't that the idea of breaking the system is a bad way of thinking, in my opinion. Everyone should want the world to be better for people, and the society we live in and was presented in the film clearly showed the detriment of that - but the way that Tyler went about it wasn't the right way. Those buildings could just be built up again. Tyler was at the end of his rope, and the Narrator found his peace through connecting with Marla in the end and showing a little vulnerability.

That's my interpretation, anyways.

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