Honestly, I get that. Driving a bike on a road with cars seems dangerous. I do it, and I don't want to die, but it's not the same as walking on the sidewalk or sitting in my yard. If there were bad choices made by the driver, then sure, let's prosecute. But passing a biker going 15mph on a 45mph road doesn't seem crazy. Going 72 in a 65 doesn't seem crazy. I like to think I'm an aware driver, and I haven't hit any bikers yet, but I've seen myself be two distracted moments away from hitting one. It's not crazy that I would be checking my maps app at the same time a police siren comes into view, leading me to miss the biker who'd just turned into the lane next to me.
The problem seems to me that we've built both physical and social structures around roads being for cars. It needs to feel comfortable to bike while taking up a whole lane, both for bikers and cars. ("Drive at the speed bikers go" isn't reasonable, imho.) Bike lanes help a lot, and having a lot of bikers around helps a lot. But we can't just start with "killing a biker is deliberate murder", because it's simply not. It's old attitudes being applied to a new world, and I'd rather find a way to bring people into the new world than punish a few of them for making a mistake.