I really don't think there's anything political about it. I know people from all over the political spectrum who discourage their kids from playing football. But that's only part of the picture. Kids have so much to attract their attention. And many kids play sports that seem to demand specialization and exclusivity. Worse, many parents play into that "my kid is the next Lebron" fantasy and encourage the year-round concentration on one sport or activity. Usually results in burnout.
If you think about it, football is about the only sport that doesn't demand attention 365 days a year...and it's headed that way.
Many people won't share my opinion, but I think the beginning of the end was when the powers that be gave in to spring ball, 7 on 7, virtual year-round weightlifting, etc.. Frankly, I think a high school coach who insists on a kid playing only one sport needs to find another line of work.
The safety factor is just one of many reasons that kids aren't coming out. And it's almost everywhere.