Did they direct the Engineers to design faulty suspension?
Management is *always* at fault, any time there's a problem. That's why they're called "management"; if they can't properly manage, they should get another job, like janitorial work. Engineers are employees, and just do what they're told, under threat of losing their job. So yes, management did direct the engineers to design a faulty suspension, one way or another, either by demanding that it be cheap, that it be done too quickly, that important analysis steps be skipped in the interest of time and cost, that safety testing not be done because of time and cost, etc.
The final quality of the product is up to management, whether it's suspension safety or wireless security. It's their job to make sure the engineering is done properly, and if they're not competent to judge that (and their employees aren't either), it's their job to hire consultants to help them with it.