Doffy without a doubt is the most cruel and sadistic character in one piece, if he actually redeems himself and tries to be a good person, it would be much more interesting if its through self reflection and regrets rather than Tsuru gave him a bath. We'd miss out on so much great character development, we'd miss out on him asking Law for forgiveness, I'd rather his redemption if it does come, come slowly over time it should feel earned and not just oh Tsuru washed him off screen so he's a good guy now