well if you read that from guys like mckenzie and mcgill then they may cause injury. when used at times they are not needed they most definitely increase the chance of injury. when used properly they greatly decrease the chance of injury.
what i learned from mcgill, whom i have read more of then mckenzie, he states that using a weight belt on exercises that apply a large load to the spine and are above 90% of your 1rm. like overheads, squats, deadlifts, etc. are good exercises to use it on.
i once saw an article by him that even stated that the 90% is for the average joe. for guys that can deadlift 600+, for example, starting to wear it at 80% can help some. it all depends on the strength of the stabilizers. and for those that are weaker then average a belt may not be needed at all.
so they have a place. they are just greatly overused. or someone will use a belt that doesn tdo much of anything other then give a placebo effect. like those belts that are thick in the back and thin up front. IMO the only way those will help is if you wear them backwards.