Firstly I think I'm a relatively nice person. Not as in a 'us nice guys can't get a break' type of weird musty masturbator but a person who will help someone out if they need help. If I'm next to a woman with a buggy at the bottom of some stairs then I'll offer to carry it, that's a fairly standard polite thing to do and should obviously be the done thing.
But lately I've realised I'm starting to pre-empt situations which means I might have to help someone and I'm cunningly removing myself from the equation so it will be someone else's problem.
Using the earlier example if I get off a busy train and there are loads of people on the platform and there's a woman with a buggy I will purposefully hang back so I don't have to be the guy that carries it up the stairs. Now if there was nobody else around I would happily offer but if there's several people in the vicinity then I make a deliberate decision not to be anywhere near her as I've done my time on many occasions and now it's their turn to be the helpful guy. If nobody offers then of course I step in but there was definitely a thought in my brain that said 'fuck that shit Capdo di tutti capi (which is what I call myself) I'm done helping people if I can avoid it).