This is the same as adultery. I don't wish to go into a philosophical argument, but you're basing your argument on this point about the girl not knowing what love truly is. You're neglecting the side of the argument in which the couple is a happy one. You can love even if you're not happy, and you can be happy without knowing love. The first part is true especially where you see a married man taking care of his wife who has a disease which causes unhappiness (eg. Schizophrenia), or a married woman sticking to her alcoholic, abusive husband out of love.
Your point being? It's still part of the USA.
*Facepalm* Okay, you're missing the point here. I can point out loads of other places where you don't have this kind of thing. In fact, I think I will if you insist on telling me where this kind of practice is carried out: Japan, China, the UK, New York, Sweden, etc... I admit that this kind of vigilante justice is carried out in certain places, but it's not a viable option to avoid this kind of thing from happening in the first place.
Excuse me? Do you even know what you're talking about anymore? You can't claim that religion supports culture. They're both separate things. In fact, those cultural practices you see that are so wrong arise from the careless misinterpretation of religious texts from a culture that has always been, before Islam, mysogynistic to an extent. Again, the fault of the individual who misread the thing in the first place.
Hypothetical scenario: Five women (Your maximum amount). Say all of them get pregnant. Are you willing to take care of five different children? Highly unlikely, but the possibility is there. Also, what about everyone else in the world. Not everyone is a 'saint' like you. Some, if not all, boyfriends leave their girlfriends entirely after discovering about the pregnancy. At least under a marriage, both parents are under a legal obligation to care for the welfare of the child.
How is it different and how is the latter a better thing? Zakat is distributed fairly among the poor (muslims) and seven other different types of people. Donating to a cause you feel strongly about means that you're singling out a fraction of the population whom you really want to help without regard, or benefit, to the other impoverished elsewhere. This kind of voluntary donation is called sadaqah in Islam fyi. Voluntary charity aside, modern secular law has nothing to say on collecting charity for the needy --in most places anyway.