gaw, IIRC the meforshim there discuss giving it because of rachmanus. There is a befeirush gemara which says that if you had in mind to do a mitzvah but was ne’enas then you still get the sechar mitzvah. The Nefesh Hachaim elaborates on it and says you get 2/3 of the sechar mitzvah as long as you had in mind to do it leshmah. I will iu”h try to hunt it down later.
