Well we agree on one thing: charter schools are public schools. As for the rest...
The charters here in MN and in many, many other places have a history of world-class incompetence and corruption that is not an anomaly. You will not see this kind of behavior in the regular public school system. Check out our charter law in MN and you will see that it's probably the toughest of all (thanks in large part to the AFT). Yet even our law has enough loopholes that no matter how well-intentioned the politicians may be, the problems persist. The charters in MN now have a more than 33% failure rate in producing auditable books, and we've had disasters with Edison Project where it took front-page headlines and prime-time news specials on the failure to bring down the school--and it still took two years to close. There's many more stories like this that I could regale you with. Why is this behavior OK for schools and scandalous for the Pentagon? The dollar amounts are comparable.
I don't begrudge poor parents for wanting to send their kids to better schools. That's why we created the magnet system and _many_ alternative schools as well, like the phenomenal Arts Ed high school (opposed by many RWers); while these schools may have waiting lists and lotteries, they do not _all_ discriminate based on achievement. I know this from personal experience; my siblings went to a magnet school where there were huge numbers of academically challenged kids. Someone here (you?) mentioned a fine arts charter school, I bet very similar to the MN Arts High School. I find it very hard to believe that a school for the arts is not going to have some admissions criteria based on talent. And like I have mentioned, the subtle forms of selectivity have been reported as well, like requiring extensive volunteer time in areas that have predominantly single-parent families, tracking special ed kids into other programs, etc. Edison took this to new levels by having the parents--and students--as a captive labor force when they started losing massive amounts of money. (They still are).
The behavior and crime problems are a separate issue. They're not what the charter people discussed when they came up with the idea, which in fact was discussed first at a national governors' conference many years ago. The issue was always about raising student achievement. Most of the charters have now been shown wanting in this regard yet again, in precisely the student populations they were created to help. City Pages (our local alternative press) covered the level of behavior and crime problems in the Edison school, and the teachers there had never seen anything like it. Furthermore, the Edison people had their own bureaucracy of suits that stifled any attempt to get the school's discipline problems under control.
The behavior problems result directly from the US allowing a level of socioeconomic disorder that other advanced countries simply will not tolerate. We're literally imploding our society into something like Brazil. Then we put the schools in charge of fixing problems they're not responsible for and don't let them boot the troublemakers. Small wonder that we have these problems, and it's inconceivable that _any_ urban public school will escape these challenges.
I'll plug Gerald Bracey again:
http://www.america-tomorrow.com/bracey/EDDRAHe has written several books on these topics.