Why many guys offer unsolicited help which actually becomes nuisance ?

Nothing in the material world goes without a price. It could be a good bargain it could be a bad bargain. But you have to pay the price, if not today tomorrow. Rarely one come across a person who is not a materialist. A stranger who talks to you on his own should be understood to be having an intention, a motive and one should be always wary of that, while being nice. The sophistication is in being candid and nice and at the same time not allowing the intrusion. The body language should not reveal need for help or dependency or an you are always welcome disposition.