Aww, no need to apologise, Sophie. As a good mother, your views on this are completely understandable!
I think an unfortunate by-product of Louis becoming a 'celebrity' is that he's now exposed to a lot of what you mentioned. And after living in a sheltered bubble for so long, he's probably just a tiny bit attracted to this newfound freedom to drink alcohol and partyyyyyy with his friends.
I, too, hope he eventually finds a lovely girl with values, and who his mother would approve of.
But in the meantime, he's a young, healthy male so as long as he's careful, and doesn't do anything to tarnish his image, I don't mind if he has a little fun.