Well the science is clear: if you're straight, white, and born after 1965 then the Wuhan Flu essentially has no effect on you.Your inability to understand science is not a valid argument against it.
— KD #FordResign (@kydaeo) April 10, 2021
So why not march? Unlike the activists upset that police give criminal blacks the fate they deserve, or are angry at Mr. Ryerson for having sensible policies about Residential Schools, or to support Muslims murdering Jews with rockets, these people care about personal liberty. That's a pretty important thing.
So they understand from the science that the risk to them, particularly outdoors, is so close to zero as to be effectively meaningless. If that's too much for you then you either had too much or too little education.