I have seen some Crossfit videos that were disturbing but I have also talked with a Crossfit instructor who was knowledgeable and sincere.
People can hurt themselves in any style class, even including Pilates and yoga. When asked about other programs, I usually try to educate the person asking about the pros and cons of any given program and let them take it from there. I would venture to say that no client of mine would be tempted to join Crossfit. To them I could give specific recommendations because I know their abilities well enough.