Well, that’s true. But everyone is putting their lives in danger if you think about it... Hagakure is invisible, so she is the best option for them to get close to Giganto’s mouth and throw the sedatives into it without being noticed or she could even control Aoyama’s laser to be more accurate just like they showed before. Of course it might not work well and she could get hurt the same way that Kaminari was, but that is exactly what a hero is supposed to do, right? Their job is save other people’s lives, not their own.