I agree with you, liontamer.
Some people just don't realize that cursing/swearing offends some people. There are some who are not bothered by it, but then there are others who find it very rude, offensive, and just plain tacky.
I see it all the time with people who get in arguements on the game. Then they start slinging some swear words at each other, offending everyone else around them. Geez, whenever someone trolls/harrasses/annoys/taunts me, I don't waste my time swearing at them.... I block them, simple as that. Not swearing and cursing shows some respect to other players around you.
And you're right about how it could influence younger players to start cursing/swearing in local chats too. They see other's doing it and automatically think it's okay, but it isn't. Unless they get caught and reported for it, they will likely continue to do it. They could think "I haven't gotten into any trouble over it. It's no big deal"
....So yeah. That's all I have to say.