Yes they do but it takes almost entire childhood, until they surpass adolescence
Social and Personality Development in Childhood | Noba (nobaproject.com)
Children can be easily manipulated due to undeveloped personality, including influencing sexual orientation, on another side it's not easy to manipulate grown up people.
Yes they do harm to others which is considered immoral, I'm not sure what are we debating here because not all laws are strictly about harming or not harming someone while no laws are immoral in nature.
It's illegal to mastrubate in public even though it doesn't harm anyone, so why is it illegal then? see, it's not all about abuse and harming others, you think of morality as of some church dogma, but morality is much more than just that.
OK, your point is that harming others is criteria to law decision making, my point is that harming others is immoral.
However not all laws are about harming others while all the decision making regarding laws is directly affected on whether something is morally just or not simply because there is no such law today which is not morally correct.
An example, no need for one, there is no immoral law, all laws are morally just, excluding exceptions by mistake or political manipulation.
I have not said that gay relationship should be criminalized because I don't consider homosexuality to be a crime but rather mental disorder.