i'm not a park person myself, but i'd challenge you to present me any actual science that suggests this is in any way dangerous to anybody. not speculation, not hyperbole, not "expert advice" - actual peer-reviewed science.
*crickets*
so, i don't think they're being reckless at all, and i will stand in solidarity with people that are pushing back against unreasonable and evidence-free restrictions on personal freedom, of which i would agree this is defined as.
if we all simply avoid the elderly as much as possible, we should be able to get through this without the need for draconian rules.
and, i hope that people continue to prioritize their freedom, and continue to push back.