I have very little patience with the regular appearance of articles that follow the below flow.
1. I believe I'm very smart
2. I fell down a rabbit hole into a subculture filled with people who also think they are smart
3. Eventually I realised that they weren't that smart, and were actually most just a fad + spite (+ generally bigotry)
4. I worked this out because I'm very smart, and now I'm here to tell you, people who never fell for it, that that subculture isn't all it claims to be
5. Wow
It never, ever comes with the realisation that maybe the problem is the initial flawed belief and the smugness inherent in it.
Falling for a cult is something that can happen to almost anyone. I think it's somewhat healthy for one to recognize they were in a cult and to share the experience of realizing that and getting out. It may come off as smug, but it's also a pretty vulnerable thing to do as you are admitting "I was duped".
The main smugness one can have is thinking they are immune to falling for a cult. Lot's of people do for lots of reasons. It's particularly likely when someone is in a vulnerable position in life (death, depression, major life change). Sometimes people are simply born into the cults and realize later that everything their family and community believes is a lie. Regardless, cults are pretty good at finding and "loving" people into the cult.
All this is to say that everyone should take a moment to question their core beliefs. Why do I believe this? Could I be wrong? How would I know I'm wrong? Questions I know I wish I asked and explored earlier in life. The honest answers, though, can be devastating if this part of your identity or family identity.