Seat belt safety laws affect everyone, it's for the common good. Most states have helmet laws if you ride a motorcycle a very sensible precaution because head injuries are usually severe and occur with a lot more frequency if you ride a motorcycle. In general I do not like blanket laws, because there are always exceptions to the rules. But since we are only human beings and it's possible for any one of us to make a horrible mistake with the use of guns, those most prone to become a mass shooters should be targeted. Raising the age on assault weapons, semi-automatic weapons to 21 is a very good idea. As I said before the hormone levels of 18 to 20 year olds is astronomical. It's a wonder any of them could think straight and act normal. There is a sharp drop off in these levels at age 21. If you compared both graphs like I asked you to then you would understand the problem too.