The poll is crap, but reversing back onto the track is worthy of discussion. I think it's particularly dangerous in the circumstances that we see in Baku. It's only a matter of time before a driver reverses out from one of the runoffs and collects a car taking the corner at speed. Their excuse will be "I didn't see him".

Just saying Ricc did a bone head move is not cutting it for me either.
IMO it's not any different from drivers trying to rejoin the track after an off. No need to create or apply different rules. I doubt that there is much difference from the visibility aspect and (not) seeing things in the mirror (except a driver is facing the wrong way when trying to rejoin the track.)
There are things to consider apart from the drivers. The most important how fast were the yellow flags out?
And instead of relying on those mostly useless mirrors, what about having a rearward looking camera installed and have a dashboard screen? Sometimes F1 could learn from roadcar applications of modern technology. Drivers still need to look into such a device however.