How common are nice guys and why can't they see that they're the problem?

dpy87
These type of dudes really piss me off because they think they deserve something in return for their "nice" behavior. Then they get all butt hurt when rejected. I don't understand how they got this way but they clearly have no knowledge of how to talk to a girl. I feel bad for them actually because I don't know how any girl would find them attractive.
How common are nice guys and why can't they see that they're the problem?
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