I consider them less responsible, but still responsible. Let’s call it a 65/35 split. If they have no choice but to use that design, then whoever forced them to do it.

People are responsible for their own behavior, but there are proven ways to reduce traffic speed in road design, and not using them is a deliberate choice. Maybe made for sensible reasons, but it’s still a choice known to increase the likelihood of someone dying, just like driving fast.