Yeah, it's easy to think only of the bad (nuisance) side of nanpa and I don't disagree there is (some) truth to that claim. But you also have to weigh the good in there too, which is what peope who don't do nanpa (or don't get nampa'd) don't see and seemingly (from some of the replies in this thread) can't imagine. I can't count the amount of times I've had girls tell me "thanks for talking to me" or "声かけてくれてありがとう!また近々に遊ぼう!,” or similarly who moan and complain that they can't find men or are sexless. I read just today
44% of young women are virgins. Not to mention the happy, glowing faces after the orgasmic tremors abide.
So if I slightly annoy one women for 5 seconds, to me that's offset by the profound and joy I can bring women over one entire night, several months, or even years, and they seem to agree. Even the women on this forum itself confess to having gone with and enjoyed being nampad (by the right guy of course).
So it's all about perspective. Am I being annoying to women here and there, quite mildly, and in a way they forget after perhaps 10 seconds? Sure, I could concede that. But I bring more laughs, joy, orgasms, and mirth to the world than annoyance, and I'm willing to put all my money behind that. What I'm doing is a public service -- both for the approaches that go well and end in romance, and those that go poorly (by instructing guys how to be LESS creepy and more calibrated and approach in a way women will at least respect, even if they aren't interested).
Everyone (interestingly, it's ALL MEN telling us how annoying it is FOR WOMEN) here who doubts it should try, and it would actually surprise you how much spontaneous joy and entertainment you can bring to the world through, as
@Dorian Gray calls it, "Guerrila sociology."
Littering is truly something which is useless and unequivocably bad behavior. Nanpa is not in the same category. In fact, it's actually a public service, and I think I should receive some taxpayer money for curbing the virginity/lovelessness/boredom/lack of spontaneity of this country