I dont get the outrage, but the guy writes well.
1. Its legal in his state (also perhaps it shouldnt be, but please direct your anger at the legislature and not at some guy who is following the law)
2. Its not YOUR daughter. What buisness of yours is it who she is or isnt fucking?
3. So the guy only wants a piece of ass. From the story, it doesnt sound like the girl has any mistaken ideas about that. Its not like he offered to marry her or anything like that. Hell, it might actually be more wrong for him to date someone that much younger (and influence her by a great degree) than to just fuck her and get it over with (influencing her life, about none at all, in the scheme of things)