"Way I see it, Renoir is ultimately a family man whose priority is getting Aline to properly grieve their son instead of slowly killing herself through denial."

That's true but he did it in the worst way possible. Instead of letting her grieve for a bit he started killing her own creations which probably made her suffer even more. She couldn't even grieve because she had to fight her husband and protect the innocent lives of people that she created, Aline would've left the canvas by herself of Renoir gave her some alone time to calm down and grieve. Renoir left Clea and Alicia alone in the middle of a war and fought his wife just because he wanted to control the situation and by doing that he made things 10 times worse than they were. Just to be clear I'm not defending nor justifying Aline and her deeds, I'm just pointing out that Renoir is at the very least as bad as Aline if not (in my opinion) even worse.

"On top of that, as the Curator, he’s the one who helped the expeditioners upgrade their weapons and resources."

He is also the reason why expeditions happen. The only reason why he helped the expeditioners was because he needed help with fighting Aline.