Most Crossfit trainers will swear that in their gym the put extra focus on proper Technic and posture, while it might be true it's pretty much inevitable that proper form will be compromised when one is pushing it's body to it's limits. Additionally there is a deep mental and emotional aspect that drives certain people to a specific type of workout like Crossfit that encourages behavior that ignores signals and pain in the short term that will result in more serious injuries in the long term.
Is Crossfit the only offender?
To be totally honest any type of sport or physical activity could be causing injuries due to over training or poor Technic (even Yoga!) however there is something extra injuring in the Cross-fit community and atmosphere that encourages needless effort, needless meaning when the activity is no longer contributing but hurting.
Is is a Gender/sex issue?
While it's safe to say that most of Crossfit trainers are makes, you would be wrong thinking that Crossfit is a "male only" sport, both genders have their own "ego driven meet heads" (aren't we all a bit ego driven?), just check out to females Cross-fit fails video: