So it's basically like "Lv2 kara Cheat datta Moto Yuusha Kouho no Mattari Isekai Life" where the MC is weak for a second to realise how much of an asshole other people are, and gain invincibility right after.
You're only "evidence" to blame the deaths on Liu Shan Men is none of the assassins killing them.
By using their name to kill Liu Shan Men, you're ruining that evidence of yours. What will you do afterwards? Say that the deaths were to cover up the rumors? Won't really work since your evidence...
@Sylphie
Yeah, but he didn't know there were other people.
... Although he was the one who pointed out that the dragon was focused on something but didn't even check
I doubt they know who MC really is, I mean, they're literally giving a guy drugs that give similiar effects to the relics, to fight against a literal human.