Why do americans assume their law which is actually state by state, is right all the times?

Some one who was 23 had asked about 16 and someone said they were a pervert because that is illegal but its not illegal in all states even over there and its far healthier relative to the fifity year old man who had asked the parents permission to marry someone of said age, still not saying its completely healthy at least at first. And in britain yes one would probably get comments for that and people would at first wonder about it but in a year folk would forget about it any way as 17 and 24 is really not so bad. I mean it is dodgy when someone is 16 but is not illegal i find it strange people are saying wait to 18 when thats not the law in many places, at the end of day most of the globe has age 16/17 and therefore that age becomes boderline acceptable whereas, correctly few places have 15 because its wrong, but its a bit incorrect to call someone a pervert if someone is 16 and bodering on rediculous if you find a 17 year old attractive its just plain aggressive unless your like 30 in which case the motives may be more suspect than a genuine attraction. I guess if an older man was continuely attracted to only 17 year olds they would be wrong but not if it were just one, an older man who acts on attraction to some one under 16 though is very wrong/perverted. I just think that terming people perverts should be keep for the more serious and less grey cases as if you band it about how would you feel if it were ure son/daughter that had those names when they werent actually breaking any laws of a given country or state thus infering they were the same as someone who acted illegally. And why would an older woman with a younger man be fine but the converse perverted yet both were legal? I think 16 in the uk is correct and well I wont apologise for thinking the current law is ok when law makers the world over agree, even in right wing america, I think higher impacts on liberty and lower destroys protection of the vulnerable, and up to a point, the balance of where someone thinks the law should be set is a personal issue but obviously some would have warped views far from consenseus and morality. But I personally would probably only date some of 17, as the hassle for a start would be too much unless it was the one you were sure you wanted to be with for the rest of time then a few dirty looks and acceptance would be worth it, luckily such situations dont happen to often lol. I know folk who are out of line with morality would think the same way but there is I think,perhaps in folly, a bit of a difference between something that is legal in many places and something which is inherrently perverted, because a child is a child and before 16 there can be no argument of what is true.