When DH and I flew in September from MCO to Detroit, there was a man sitting in the row in front of us, using many horrible racial slurs, and se* talk. I mean crude and awful. Our mouths literally dropped, as did all the passengers we could see as they were turning back and looking our way. This went on for several minutes until the college kid next to him started talking to him and changing the subject, often. When it would go quiet the "man" would start up again

, the college student would then start talking to change the subject. I mean we are up how many thousand feet in the air, its not a place you want to start trouble if you know what I mean.
So, you ask why do I HAVE to sit by my daughter who is 13. That is why. Trust me, if there had been any children on that flight, and there was not, we would have done something immediately. But we chose to remain silent as every other passenger in ear shot, as the college student seemed to be able to deter him to other conversation.
Now, what if my daughter is sitting next to someone like that, and no one is handling the situation. You have no idea who is on the plane, and no way am I having a total stranger sit by my minor child without me.
So we will not fly an airline that we cannot be guaranteed seats together. We always fly Airtran, and I was looking into using rewards for SW, but it didn't work out. Thankfully it didn't work out, as I was unaware at the time of the seating.