I love how everyone is like "Yo, I know Hak is our enemy, but I like the guy, so I'll help, protect and fight with him"😂
From their point of view Joo-doh is the only reasonable person. Like I totally get it, he's seen with his own eyes just how much of a monster Hak can be, what hatred and bloodlust drives him. It would be unreasonable not to be anxious about him going on a rampage again, because he knows no one present can stop him. I don't like it, but I get it.
But the fact that Yona told him that it's fine and that she is alright really calmed him down. He can control himself and bury his emotions when it's only about him, he only lost it that much last time because in his mind Yona was not fine.