The problem here is that if people stop biking until it becomes safer, then city planners and elected officials will say "why do we need to spend millions to install biking infrastructure (and disrupt car infrastructure), nobody is out biking!"

Yes, its dangerous, because other people make it dangerous. The unfortunate reality of living in America is that a lot of people do a lot of things that are not terribly hazardous to themselves but are quite hazardous to other people. As a parent, I have chosen to do what I can to mitigate the risks as best as I can, short of just staying home, or driving everywhere.

Honestly, this bicyclist was killed at a location where I would feel comfortable riding with my kids. Its fairly low traffic, has decent bike lanes, and the speed limit is low. The simple fact of the matter is that unless you build serious infrastructure, no bike thoroughfare is safe from sufficiently motivated/reckless/drunk drivers. Based on the accident details (especially the driver having minor injuries), this sounds like somebody driving waaaay too fast for the road. All of this to say, this isn't an argument for stopping biking, or biking without kids, but it is an argument for more aggressively enforcing traffic laws on these roads that are tempting to joy riders, and improving biking infrastructure so its harder for these accidents to occur.