What makes evolution go backwards?

Voting Democrat.

/This dumpster fire brought to you by the letters O and F, and the number threeve
 
"They're two sides of the same coin," Fisher explains. "On one side, traits evolve that benefit your kin, but don't benefit you, because you're helping your siblings or cousins. On the other side, traits that benefit you but cost your neighbours don't evolve, because you're causing damage to related individuals."

I don't know if it's bad writing / missing context, or what, but the obvious answer here is that evolution benefits the species, not the individual. And genetic diversity is one of those benefits, as otherwise a single disease could wipe out everyone.
 
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Evolution going backwards is when a young person has kids with an old person.Maybe that's just slowing down evolution.
 
The huge dichotomy is that while things evolve they are in a constant state of atrophy. Mind twisting when you think about it too long.
 
Reversing evolution is when you mate out of pity not preference