None of these games are dangerous.
You know,.. I'm getting really tired of this. These are the kinds of games kids have been playing for generations (not really kick-ball. But tag, dodge-ball, red-rover, freeze-tag, and of course the fucking classics! Baseball, basketball, soccer,.. etc) - and some over-protective diaper sniffing, my-kid-is-my-best-and-ONLY-friend, soccer parents who think all kids are precious and should be treated like delicate invalids throw hissy fits.
You know why childhood obesity and lethargy is a problem?
A.) They are stuffing the kids face with crap.
B.) They discourage physical education (which can also harms social skills)
C.) Parents can't seem to understand parental controls. (They can, they just don't want to.)
These games are a good thing. They encourage physical fitness, a bit of healthy competition, and TEAMWORK. Learning to work as a team with their peers. Not only that - shits fun. It's FUN. Remember, fun? When the street lamps go on and you go home: you stink like outside, you're sweaty, you're a bit banged up - but damn it, you had some FUN.