The opposite could be said, in that if masks were not required it is those attending the parks responsibility to wash their hands and keep their distance.
Instead you will have more people removing masks to eat, drink, speak to each other, touching the masks and then touching everything else which will spread germs more.
Not to mention masks falling off and landing on others, and the idea that masks in general actually harm your bodies immune system more than help it.
Just a little insight from another viewpoint to consider. If you don’t believe me, feel free to research or Pm me and I’ll gladly share more.