To do it without hurting him? I dunno. This is something that I don't have. Uke attacks and then does exactly the worst thing possible, makes him/herself vulnerable, and doesn't even know it -- no, I don't have the ability to make the technique effective (the technique that we're supposed to be doing, not something else) and not hurt my partner. Maybe some day.
Yeah. Given a choice between personally looking bad and injuring my partner, I'm willing to look bad every single time. And if that leaves my partner thinking "aikido doesn't work," well, I guess I'll just have to take that risk.