At this point, I don’t think TA actually cares about “right or wrong” as much as he claims. He’s just refusing to redeem Chloe because he’s still trying to sell that moral, which has long been dead.
Marinette stared down at her corrupted Chaton, his eyes a piercing blue as he held out the small box, he was down on one knee, his smile wide as he looked at her with so much love and lust, her heart was doing backflips as he looked at her like she was some delicious prize. Marinette placed her hands on her mouth, just like how all the women do when their lover proposes to them, but Chat Blanc wasn’t her lover...he wasn’t even hers. Chat Blanc looked at her lovingly while Marinette looked at him horrified; she was so confused! “But-but you're in love with another girl! You told me on patrol many times! I tried to move on from you!" Chat Blanc frowned and stood up then he let out a deep terrifying laugh almost as if he was going insane.
“Oh, my lady, my precious Princess, my beautiful Marinette” he chuckles under his breath, “For an incredibly smart woman…” his claws grasp a few strands of her dark raven hair, the pieces slipping through his sharp claws. “…you’re very oblivious and dumb when it comes to being seduced.” Marinette could only gape at him as his clawed hand popped open the small ring box. “The girl I fell in love with was you, my Marinette.”
Miraculous: Tales of Ladybug and Chatnoir would've been so much better if the writers gave both Ladybug AND Chatnoir powers essential to defeat an akuma. Imagine,
Ladybug- Creation- The Miraculous Ladybug power which recreates all that shouldn't have, but was, destroyed.
Chat noir- Destruction- The power to purify akumas which allows the weilder to destroy what shouldn't have, but was, created.
Ying and yang, good luck and bad luck, creation and destruction, perfect balance.
They both would've used their powers for good because, as Tikki and Master Fu and all those wise, ancient beings point out, destruction is just as important as creation, dark is just as important as light, bad luck is just as important as good luck (which would've been such a cool theme to dig into but gods forbid the writers ever use this show's full potential).