Barty doesn't get much back story, but here's what we do know: he's a high-up official in Ministry of Magic law enforcement, and he disavowed his very own son when it was discovered he was in league with Voldemort.
Now, granted, his son Barty Junior is a terrible person, but think about what it must take to send your son to prison. Sirius puts it best when he's giving Harry the lowdown on the various suspects in the case of "Who Put Harry's Name in the Goblet of Fire?":
SIRIUS: Then there's Barty Crouch. Heart of stone. Sent his own son to Azkaban.
We want to cut Barty Sr. some slack—it's a good thing that he sent his sociopathic murdering son to prison—but man, can you imagine being able to do that to your own kid? Sirius isn't wrong.
Barty Junior seems to share the whole "heart of stone" thing with his dear papa, since he kills his dad the minute it becomes clear that Barty Senior has seen through his disguise. Aw, Barty, we barely knew ye.