As an instructor, your job is to program group exercises that don't lead to injury. As a trainer with half a brain cell, your job is to not commit malpractice and explain faults before somebody hurts themselves. As a business man, your job is to avoid liability during a workout by preventing your clients from doing stupid shit.
I paid the 1000 dollars to be a level one certified "trainer" back when I drank the Kool-Aid. Crossfit instructs its trainers that there is a "20% slop" factor in all movements. Seriously, it's not a joke, it's the main reason got out of it entirely. The only time any XF "athlete" is actually called out on form is when they are competing at one of their "games." I highly, and I mean
fucking highly, question that those pull ups were done properly. At minimum, they were kipped. At worst, they were butterflies. Both will lead to SLAP tears if done for high reps.
In addition to that Greg Glassmen (the "creator" of Crossfit) at a speech he did for a group of military physical trainers/doctors stated that doing the movements with poor form was actually better than not doing them at all, using specific examples like bent back deadlifts and straight legged squats. Essentially, encouraging people to do poor lifting because it's better than not lifting (tell that to a 35 year old with a bad back doing a poor deadlift). During the same speech, he boasted about how the work outs could kill people.
I've said this before, there's a very good reason why they had to create a risk retention group (regular liability insurance stopped covering their gyms), a reason their trainers have been sued for giving fit athletes rhabdomyolysis, and a reason they have a fairly stacked injury page (
SLAP,
rhabdo,
slipped disks.)
There are some pretty solid circuits that can be done safely and will put a damper on you, I like Fran for instance. However, if you're looking for a actually halfway decent "Crossfit" programming, buy the 5/3/1 version 2.0 book and follows Jim's suggestions. It'll cost less than the 150 or so per month that one of their boxes charge you and you'll be fully functional when you're 40.
EDIT: Then there's the fact that Mark Rippetoe, Robb Wolf, Greg Everett, etc, people who were brought in to add expertiece to the idea of what "crossfit" was supposed to represent were either removed from the company or just quit due to it's current direction. How about Brian Mackenzie being associated with crossfit as one of their resident endurance "expert" who believes that a more focused approach on XF style WODs with occasionally mixed in LSD will result in much better 100mi run/ironman/etc times, yet B-Mac 'n cheese rarely, if ever, finishes a race using the protocol he invented and pushes. It's a fucking joke.