Why don't people let their adult children handle their own problems?

There's always posts about the problems with the youth of today but there's also a lot of people who ask for advice or outright intervene with their over 18 year old children.

Doing things like calling lawyers for them, some people have parents who call college professors, or work interventions.

Why not let those adult children make their own mistakes, figure out the solution, and pay for the consequences?