It's not necessarily trusting the defense, it's hoping something good happens, maybe holding calls, maybe something else, but I am not a fan of giving up that field position.
In all honesty, if they have the hands team on the field, I'm kicking it deep, they won't have their blockers in. If they come out without the hands team, I'd try it, but in that scenario, I would kick it deep since they had all their Guys waiting for the on side attempt.