Is it bad for insiders to want out? Is it bad for owners to sell when they think it is overpriced? I think this is extremely common, if not necessary, part of

Is it bad for insiders to want out? Is it bad for owners to sell when they think it is overpriced? I think this is extremely common, if not necessary, part of a functioning market and price discovery. It happens with not just IPOs but also secondary offerings. Some of this seems like dumb retail wanting to toughtlessly buy without consideration of risk.