There's a saying, "choose your poison and die happy" so you've clearly chosen the best poison, as, if one expired after giving from his heart, he'll die happy, less baggage, knowing that no one can take even a penny with them into the afterlife. My parents are ridiculously charitable and I never blamed them, as I grew up to be the same, and we have ridiculous traditions too, so what you felt was your conscience telling you how you should've done better, but the way your mind partly opposed the act of giving more might have been shaped by peer-pressure from somehow non-charitable individuals that would not choose to support the needy because of their exposure to that particular selfish behaviour, so that's them, not you, but the thought that it would've probably been better had you given him more is a very valid thought, stemming from the alpha waves of your mind's core, might haunt you in some way but take it as a win, though