I strongly disagree. People walking along roads die every day. It is not safe. That exact situation may not have been foreseeable. But when you add up all of the different possible scenarios and reasons people may drive recklessly, it becomes practically inevitable that something like this will happen. If the only route people have to walk somewhere is along fast traffic, people will die. And if we refuse to develop alternatives (which are very affordable for pedestrian infrastructure) then we are choosing to kill these people by our inaction.

In Thailand, there very often aren't any sidewalks. Also, a lot of drivers are at best marginally competent and safety consciousness is a foreign concept. Add to that rapidly increasing car traffic and very car centric traffic policies and you have a recipe for disaster. While this was certainly an outlier, the death toll in Thai traffic is horrific.