I'm not familiar with the sad situation you relate, but I do not believe it has anything to do with the parent comment. Also, I have noticed that at least half of the bicyclists in my area do not obey traffic laws in any form, and the rest obey them sporadically. They don't stay on their side of the road. They don't signal. They don't maintain safe distances. They cut traffic off. The list goes on. Many of the offenders are "professional" riders too. They compete at the local velodrome. They have friken sponsors. Hence, they should know better. When one of these idiots dies, and leaves behind a grieving family and friends, I feel bad for the survivors. However, any anger I have goes right to the idiot who got run over by the 18 wheeler because he did something stupid, not the poor truck driver who just happened to be at the wrong place at the wrong time and now has the face of said idiot burned into his mind for the rest of his life. Just because the bicyclist lost the fight with the truck does not mean it's not his fault.
Really, that's what makes people feel anger toward bicyclists. We all know how we would feel if we were that truck driver. The deceased problems are over. The survivors, including the driver, have to live with it. There is a lot more to weigh down on you then traffic tickets in that situation. I know that if some stupid bicyclist would run a stop sign around a blind corner and I hit and killed him, I would feel absolutely horrible for a long, long time. It doesn't matter who's fault it is. You feel horrible unless you're dead.
The article you mentioned seems to indicate the parents of that 7 year old were not at fault for the accident, but rather the driver was. That's a sad situation, and I would have fully expected the driver to face charges. Definitely a break down of justice in that case.