Why is it that conservatives are more generous according to the book "Who Really Cares"

by a formerly liberal Syracuse Professor, who became conservative after he researched this, what turned out to be fact? Did yu also know that according to RFK, who I believe on this has sold that Democrats own 55% of the wealth and conservatives 45%. There are anectodal stories too about how little the liberal politicains donate to charity particularly Bernie Sanders. Ironically a RINO, Mitt Romney donates the most percentage wise but Trump donates a ton too.