*Obviously we see Maki being viewed as dangerous by herself and others; I can't even tell anymore if it's obvious that Kiibo shares that experience to some degree or if I'm just too deep in my own Kiibo lore... But here's 2 thoughts on why I think that's something they canonically share:

They both hurt someone close to them in their backstories, and that weighs on them enough that both of their Harmonious Heart events are about wondering if that person would hold it against them. Also for reasons I won't elaborate on here, I'm pretty sure Kiibo at least subconsciously views himself as a danger to others due to the environment he grew up in after Iidabashi was injured. I mean imagine having an emergency stop button permanently installed on your body "just in case."

Despite everyone's backstories being fictional, Kiibo and Maki have still killed one real person each --- Kiibo killed Tsumugi (and endangered everyone else), and Maki effectively killed Kokichi/Kaito ('effectively' just as in it could create the kind of "I killed a guy" guilt that is relevant to this discussion. I'm not going to even comment on the actual causality of that entire situation). Even if you don't count that, Kiibo being the only person with a body count is an interesting reversal given he's a pacifist and seems to have the most rigid moral code of the cast (something I also think was a precaution of sorts).