If a rival in some competitive domain (think work, or romance) is falling behind me, instead of feeling happy about this (schadenfreude) I feel sad and I tend to dissipate my own relative advantage by trying to bring my rival up to my level.

I also have limited emotional motivation to take revenge or even strategic retribution (because I don't enjoy the suffering of those who wrong me). I get angry or morally outraged, but anger can only take you so far - you need to be able to follow through with the punishment. So when I play real life zero sum prisoner's dilemma style games, I tend to cooperate far too long before punishing defecting opponents.

Basically, lacking schadenfreude makes it so that I don't feel any strong desire to defeat or punish anyone, even direct rivals or wrongdoers.