Where is the respect?

Well, once again the Reichard family found themselves at the local McDonald's. I am using the Internet and the kids did their homework, ate a snack and are playing. We have a usual spot we sit. It is by the only outlet in the place. It just so happens to be in the play room. When we arrived today, which was around 4pm, there were a bunch of teenagers sitting in our usual spot and the whole play room was full so we sat in the main lobby. No biggy, we waited until it cleared out and our spot was free and we moved. When we walked into the play area, the place was filthy! Food everywhere, the teenagers had a food fight with all kinds of Gummi worms and bears and salt and anything else they could get their hands on. They had left half eaten food all over every table, all over the floor and even on the seats. We sat in our regular spot and looked at the table across from us and clearly drawn on the table was an offensive image of men's private parts. How rude and disrespectful. Where do these teenagers get off thinking it is ok to do this where there are little kids? I of course have my almost 19 year old son with me and I looked at him and asked him if he knew how disrespectful what they had done was. He said of course. I then asked him if he knew what I would do to him if I ever found out he had done something similar to this. He smiled and nodded and said, I probably wouldn't be alive. Why were these kids allowed to do this? Where was the management? They should have been asked to leave. I think that we as parents need to teach our kids to have more respect for others. Those kids should have been given a mop, broom, cloth and spray and told to clean up the mess they had made. What do you think?