Plus beyond the safety factor is the overall impact that a poorly designed lift can have on all of us.
For example, Jack E. buys this kit to lift his MJ. Works fine for a month or so till he goes to pick up a load of bricks for his new patio. He's on his way home doing the speed limit when both blocks shift to the left putting his bed into the LR tire and causing him to swerve 2 feet into oncoming traffic. The 19 year old girl in the car he hits head on, who happens to be the senators neice, dies instantly. Crash reconstruction determines that the poorly designed lift is 100% at fault, sucks for Jerry & Myrtle but it doesn't end there...Two weeks later the Governor of OK, under knee-jerk pressure from his constituents, has fast tracked a statewide ban on ALL lifted vehicles and ordered law enforcement agencies to institute a zero tolerance policy on policing it.
I know that's a kind of kooky and unlikely story, but my point is that things like this (unsafe lifts) are exactly the ammunition that greens and politicians use when it comes time for new legislation regarding altered vehicle height rules.
A thread like this has a lot more power then you give it credit, just ask Mark's Motors in AZ what kind of power the internet has to force a business to act responsibley.