I'd also like to say that some parents are either incredibly busy and don't have time to teach the kids how to play, are not interested enough in what their kids are doing to teach them how to play, or are for one reason or another unabe to understand the rules (such as them not speaking English). Sounds like some of you here have some very attentive parents who will take a lot of their time and get themselves involved in what you are doing.
Not all parents are like that, and not all can be like that. It all comes down to the jobs they have and the style of parenting they have, and how they lived earlier in their lives.
I had a friend in high school, for instance, whose parents can only speak Spanish. (He can speak English fine though.) They are also so busy that he had to take care of school-related matters as his parents were always running around because of their jobs. They care about him deeply, but they know there is only so much they could help him with. He doesn't play the Pokémon TCG, but if he did, he would have had to learn entirely without parental help. (He's smart though, so he likely wouldn't need parental help in the first place.)
Really, a lot of families have both parents working 8 hours per day every day of the week, maybe except Sundays, which they use their reduced hours to relax. This means the kids are left to their own devices most of the time, and in turn, this means the parents need to find something, anything, to occupy the kids. Pokémon League happens to be one of them, and the same goes for Pokémon card tournaments that happen to be in the area.
I like that there are kids at my local Pokémon League, and if one has trouble, I will help them learn to play the game as I enjoy helping people. In addition to there being new blood to keep the game alive, and that they're there to have fun, there is one more beneficial thing to being here: They are here to have fun, and you can be thankful they're not spending their time having fun in more destructive ways. I don't know about other places, but here in Los Angeles, gang culture is strong. At my middle school, most of the kids wanted to join gangs to beat up cops and spray graffiti and all that. That's because these kids never found a hobby or something they truly have fun doing. The kids going to Pokémon League and these tournaments have found an outlet that doesn't inflict harm or is illegal in any way. If you react hostilely to these kids, you may scare them off and send them on a slippery slope. Every kid in your Pokémon League is one fewer kid being taught how to smoke by his older friends. (My father used to run a liquor store, and this was a common problem.)