I really agree with you on the ignorance and laziness of reporters on the engineering aspects. The continuous reports of structural flaws was a perfect example.
Although now that I look at it, they may have actually just dumped thier loads as only 1 looks like it is full, and there is rock already dumped onto the bridge.
Still, the rock, dirt and trucks is all concentrated in one place, and it looks like it may be the span that falls straight down in the video.