Your experience notwithstanding, Westside is not dangerous. Box squats are not dangerous. Statisitics have shown that all forms of weight training are much safer than just about any type of running, and certainly safer than plyos. Its not a matter of safety, period. Its about getting as strong as you can (or need to) effeciently and effectively. Powerlifting squats are not for everyone, but they are effective at building limit strength and they are NOT dangerous.