I find the concept of sheeple interesting.
Because people who use that word are a little bit like alternative lifestylers, who see themselves as free thinkers without acknowledging they too are following a particular trend.
When it comes to vaccines/covid, to call everyone following the safety measures 'sheeple' implies that those who are against the rules came to that conclusion themselves without any influence from anyone else. ...
If the term 'Sheeple' must be used, the covid-sceptics and anti-vaxxers are just sheeple from a smaller herd.
If you say the term 'sheeple' means 'those who follow the rules without question', then that might apply to some people but is mostly untrue.
In my experience it is those who are the most informed who follow the rules. It is not an unquestioning following of the rules, but keeping up with the 'best' way to tackle things (right or wrong).