Why kids scratch swearing words. Not Funny!

Kids think that scratching swearing words is fun or funny but it's not fun or funny at all, while i was working on a saturday and a kid told me that another kid who was either a child or a teenager was scratching swearing words on the playland structure i,m guessing that the kid heard his or her parents saying swearing words. I was very uncomfortiable when i saw three swearing words in the playland structure i try to clean it off with a washcloth but it was scratched on the green side of the playland structure, but it would not come off the three swearing words started with a letter F that which i rather not say on this blog, all i,m just is this do not use swearing words in front of a child especially in front of a child because that is not right or funny at all! Otherwise that child will repeat them and srcatch them on the playland structure and will think that it's funny that which it was not funny, don't let a child hear those words i mean that is just not right.