I think anyone over the age of 15 (birth year has nothing to do with it, common sense does) should be well aware that getting hit in the noggin can't be good for your long-term brain health. Same thing applies to hitting others in the noggin. Better pay than pumping gas though.
Things you can do that might help your guilt:
1. Charitable donation to CTE research
2. Last Will and Testament to CTE research
3. Letters of condolence to affected families
4. Watch less physical sports such as golf, ladies hockey, etc. and avoid watching football, soccer, men's hockey, boxing, MMA, baseball, basketball, etc.
Things that might help with your guilt but will not solve any problems:
1. Donating a few minutes of your time whining like a wokie on a free internet forum about injuries in pro sports.