Not all vaccines are created equal. Grouping people in "pro/anti-vax" carries a risk of creating a huge backlash against vaccination in general, if the relatively new and unproven mRNA vaccines end up less than ideal. For example the virus mutates to bypass the very specific protein the vaccine targets, or there are serious side effects, possibly on the reproductive path, a few years down the pipeline. Consider being more specific, for example 'pro/anti mRNA Covid vaccines'.