That still doesn't justify the behaviour though, but I understand where you're coming from and I kinda reject them, the youth and elderly are becoming increasingly polarised in several fields such as sexuality and political leanings compared with previous generation of the same age. And this sort of implies that behaviour is fixated at a young age, which it isn't. Yes it's heavily influenced but the theory seems to be taken generalizations and basing everything it stands on on those generalizations, much like what autogynephilia did for trans people.
its theory for a reason, and has been criticized by many people through time but there must be something about it as it can be applied successfully to many cases through time
most of your behavior is put in place at a young age as your brain automatically adjusts to its environment for the sake of your own survival in both the world but also your social group. Morals, ideals and behavior is therefor very specific to you
we did a case on a toddler that went three weeks after birth without any meaningful contact between its parents (eye contact, extended periods of playtime/care/presence with the parents)
the parents were frequent abusers of weed and other drugs
the toddler grew up to trust people extremely easily (which was exploited by people with ill intent, forcing him to buy stuff for them like iphones because "muh friendship"), have anger issues due to neglect and anger being the only way to get attention, along with many other self-destructive behaviors such as substance abuse to the point that he couldn't afford rent
he became close to the exact same his parents were, which then proves the theory to be applicable
of course i don't doubt you could apply a different theory to the same scenario, but it's just an example of a study done with the theory