Good point. He's just pissed off at Null for tipping the police off that Chris stole Barb's money and he's upset that the law doesnt allow sex between an adult child and their parent.
He knows all this shit is wrong. Remember when Null confronted Chris on both crimes? He danced around the question or straight up lied about it because he knew he did wrong, but he should be excused of all crimes because x, y and z.
"Oh, but I was going to pay her back, besides what about poor defenseless ol' me?!" or, "We're grown ups and no one was hurt, in fact I'm sure she liked it!"
Excuses, like always. If you brought up the fact any contact with the victim (stealing money from her bank account included) was cause for arrest, he'd probably say " If you guys hadn't kicked me out of my house, I wouldnt have had to do that- and my last money was used for my brony convention costume- WHICH you jerks made me miss! If anything, the state owes me money for damages!"
Just flip the situation around. Had someone raped him, then stole nearly $1000 from his bank, I'd love to see how well and calm Chris handles the situation.