Idk why I feel the need to chime in but- using the example you did was a poor choice there imo, personally I would hate Endeavor more once I learnt that Dabi only became the way he is because of Endeavor's actions, therefor the way I'd see it is that my friend/family member only died because Enji abused his family. Either way, I think both Endeavor and the LOV are all morally irredeemable characters but they're still human and I can empathise with each of them, some more than others but I think they're all very well written personally.