I can almost feel a story behind this image.
 
You’d guess that after years of being a villain Sunset would have some problems dealing with the whole friendship thing, so I wouldn’t be surprised some emotional conflicts (despite how minor they could be) would send her beyond the crazy levels Twilight reached.
 
Just try to picture a situation similar to one of the Twilight episodes but with shimmer in place, things would get bad really fast and she’d be prone to have a relapse and take the wrong decisions (as in, things that could hurt others) believing they are the right ones.
 
…
 
Anyway, crazy sunset is best sunset.

The Cage…  
The Cage…

“KILL THE SPARKLE, TAKE HER HOUSE”
 
“KILLTHESPARKLE,TAKEHERHOUSE”

hugs There, there Sunset. We’ll get through this.

This pony is in dire need of hugs.

Sunset Snapper? Sounds like a fish…
 
Also, I like to think this is a follow-up to >>504401. “It’s fine. Everything’s fine. They won’t dissect me. Not if I take over the world first!”

insane-ify ALL the ponies!