In comparison to other sports, football is a contact sport. In almost every other sport there is no touching or there will be a penalty.
THERE IS NO PENALTY
Yes faceguarding is a penalty in college football
There is no penalty for that
There is no evidence that such a penalty exists in any football league currently.
Spearing is a fifteen yard penalty.
It is considered a personal foul and is a 15 yard penalty. -Football official
This penalty is called "Clipping".
If you tackle in flag football it is a penalty.