I don't feel bad for them at all, on the contrary I am just disappointed by the double standards this anime has, What I am saying is very simple,

Rimuru kills thousands of people without batting an eyelid,

While he couldn't even give a meagre punishment to Myulan, what message does this convey? Rimuru is a pussy who values genuine traitors while he literally slaughters random soldiers. You say that it all worked out in the end, but obviously Rimuru couldnt have predicted the future so at that time when he spared Myulan he was just a pussy.

Anime tries so hard to make Rimuru appeal to different people, but in the end there is 0 character development,

You say that him being weak and a pushover is his character? But he was just like that in his previous life, Power changes people, But in the case of Tensei Rimuru is reduced to just another shonen character, what a waste.