@blackzombie Sure, in the long run my policy of giving takebacks for slips actually hurts me, because many people refuse takebacks when I slip, and I always give takebacks for clear slips. I accept that because I think it is better to be sportsmanlike.
In situations where a slip isn't obvious, I neither ask nor give takebacks. I don't have a strong reaction for either choice in those situations though. It is a judgement call, which can be difficult, but that's life.
I don't think tennis:chess is a good analogy. Tennis is a physical sport. Control over your body is not just necessary but it is a key tenet of the sport. Therefore, slips there are just playing poorly. Chess is a mental sport. Releasing your mouse button a fraction of a centimeter too soon is not a defining skill for chess. Mistakes in chess are widely thought of as miscalculation or poor strategy, not mousing skills. If someone is more prone to mouse slips than I am, I don't think that means I am therefore better at chess. If someone is more clumsy than me and falls a lot in tennis, I would think I am better at tennis.
I often call an opponent who won't give a takeback a poor sport. I also always thank a person who gives a takeback that is clearly warranted. I don't think keeping my opinion to myself is necessary to be "fair, generous, and broad-minded." I will admit that I take it too far on occasion if I am having a bad day. That is not good behavior, but unfortunately it is very human.