Pretty obvious that Gottlieb has a hostile attitude toward the rich and educated. But after the beating up of the black dude, I'd say he just likes the "Power". He can lie as much as he wants. As long as he doesn't get caught and has the DA on his side, he maintains his "superior" testimony role.
Yeah, but it's gutless power. The jerk doesn't have the cajones to play tough with the real dirt in Durham. He's a joke; albeit a dangerous one. Hopefully, he'll get his comeuppance soon.....