I merely made an opposite assumption, to prove either assumption could be right and that we shouldn’t assume anything unless we get all the facts.

Suggesting that the victim riding "unsafely" was the cause for their death and not the person driving the very dangerous vehicle around other humans kinda is defending the motorist, though. Unless the victim suicidally leaped in front of a moving car (which I doubt, but could happen I guess), saying the manner in which the cyclist was riding is relevant at all is a defense of the driver. I agree we shouldn't necessarily say the motorist was driving recklessly without more context, but even if they weren't being reckless you're still defending them.

I agree that some people take the fuckcars rhetoric too far, but have you seen or heard the kinds of things motorists say about cyclists? Check around FB pages local to you for any posts relating to cyclists, and you'll see people unironically wishing they could murder people with their vehicles. Does this justify shitting on everyone who ever uses a car? Of course not, but I think it explains it a bit. It takes a lot of effort to not make it into an "us vs them" thing when the a lot of motorists see a cyclist simply existing as an attack on their person and their lifestyle.

When I drive, I often see cyclists in the middle of the road as if they were a car so they end up blocking traffic.

This is an infrastructure issue, not an individual issue. If people are opting to be in the middle of the road rather than a bike lane, then what you have is a bad bike lane, not bad cyclists.

Saying guys with large trucks have small penises[...] It’s childish pure and simple.

This I completely agree with, the amount of body-shaming I saw on /r/fuckcars was pretty disgusting. I've always been one to shame people for their idiotic actions and decisions (like driving a truck in an urban area) rather than the imagined size of a body part.