Tinting the front windows WILL attract unwanted attention not thieves trying to look in but the police not worth it is all I am saying and trying to see why you have bothered.
Tinting the fronts with the lightest tint gives it the extra glare just to finish the rest of the car off. Thats why I did it, Ive always tinted windows on my cars and this is the first one to have the fronts done because I thought the same as you "What is the point" but having done it on my Leon I think it just adds that little bit extra and makes it look a lot better.
Thieves are always going to be atracted to your car if it has been modded in any way or not. The tint on the front is not noticable to someone that is not looking for it. I have friends which dont realise that they are tinted and you cant tell even if you put the window down. The guy who has doen them has done a top job on them.
Don't get me wrong I technically know it is illegal but at the same time if a copper manages to notice without a machine on him I would really impressed.