I have to believe that the vast majority of people have been exposed to Covid on some level or another, maybe not direct contact, but odds are you've touched something or been in the same space as a Covid positive person.
Ultimately in regards to resuming youth sports, the difference in opinions is based on someone's individual perception of risk (aka fear) and the level of risk they're willing to accept. Based on the comments here, it appears that those who are most fearful, are basing their fear on what could happen, whereas those who are less fearful are basing it on what has actually happened. When I've posted good, or positive information, I can't tell you how many posters have basically said "oh just wait, its going to get worse" like were going to run out of icu beds, doctors are going to have to make life or death decisions on who to treat etc. The common justification was "lag time". I heard that every time when I mentioned how well Georgia was doing with their reopening, "oh no you have wait a month" a month passes with the number of deaths plummeting, "oh no, you have to wait a few more months, be patient". Two months later and Covid deaths in Georgia continue to plummet. It's incredible how many people use the "lag time" argument to just kick the can of Covid fears down the road. News flash, Covid isn't going away, but its basically only dangerous to a minority of people with very identifiable characteristics.
At the end of the day, I'm not going to convince those that disagree with me. Which is the beauty of choice, just don't project your fears on my behavior or others and take my choice away. While I wear a mask in public out of respect for others, there is simple solution if you run into someone that isn't, move 6 feet away. No harm, no foul.