Devero could, if the situation was sufficiently extreme, but he would feel very bad about it

Knock Out...is a Decepticon, i.e. the veteran of an interminable space robot war. he can do a murder, and he'll probably feel a LOT less bad about it than Dev lmao

Mikaela is a little harder. On the one hand, she's a pretty average teenage girl. On the other, she lopped Frenzy's head off without a hesitation, and took a blowtorch to Wheelie's eye...

I feel like she would, if the situation was sufficiently extreme ala Dev, but unlike Dev, she probably wouldn't feel bad about it.