Actually, our ancestors were mainly insect eating leaf-eaters who also ate fruit until about 2.5 Mya. We slowly evolved a penchant for meat which culminated in our ancestors' large (pre-human) brains about 200 kya. Then we really started eating meat; it comprised probably more than half our diet. Homo sapiens sapiens (that would be us) appeared about 35 kya with a digestive system thoroughly adapted for meat eating. 10 kya we started farming, our body size decreased as did our constitution and life expectancy. Berries were probably a rare treat for most of our ancestors.
As for being vegan on the paleo diet, this is contrary to the whole point of the paleo diet. The paleo diet is about eating what our ancestors evolved to eat (that is, lean meats, fruits and vegetables but not grain, dairy or beans), not about someone's idea of morality.
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