I have been there numerous times to the City Museum. In my opinion, if you don't walk out of there with at least a bruise or two, you didn't play hard enough. There are rules, yes but the rest is common sense. It seems to me that these individuals that had gotten hurt didn't have any to begin with and decided to start suing.
City Museum in St. Louis is a safe place, again, you have to have common sense.
About the Alcohol part...that is only served outside in a little shack of sorts. It isn't served inside at all. Yes the little shack outside connects to the inside but there is a bouncer or two that states that you cannot go beyond a certain point with your drinks. ID's are checked to verify your age.
Museum is open late on Friday and Saturday until 1AM, that is the latest they stay open.
In cooler months, they have a fire pit inside the jungle gym of sorts where people gather to not only get warm but occasionally, roast marshmallows and have smores. The fire was maintained by an adult not of the City Museum, but an adult with common sense.
The City Museum in St. Louis is a great experience time and time again. Every time I go, I always find something new I had not seen before. I enjoy going there and will be returning again toward the end of this month for a birthday party so I cannot wait.
Put not your trust in money, but put your money in trust.