When you go to the shop to buy alcohol you need to show an id. So, adults are free to buy alcohol but not children. Why is this any different?
I understand that the problem comes from the amount of chat abuse in on-line communities. It not just swearing but the constant harrasement as soon as someone is losing a match, or even if they are winning.
I understand your concerns, but ignoring the chat problem paints a partial picture of the situation.