I love my dog too but I don't want her to break my neck if we have a wreck. And even if she doesn't injure me, I don't want her to be thrown all over the place like a steel ball in a pin ball machine. Think of what that would do to her. Would you like for some powerful force to pick you up and hurl you into a cabinet or windshield? Would you drop your dog out of a 10 story window? It's about the same thing.
Pet restraints may not be perfect yet but they are better than nothing. My dog always rides in her pet taxi in the car, and I strap the taxi down with the seat belt. It offers her some measure of protection and keeps her confined so that she isn't a distraction to me while I'm driving. She isn't jumping in and out of my lap or jumping into the floorboard and getting around my feet. She is much safer when she is in her taxi. I am responsible for my dog and I do the best I can to protect her. I would no more let her ride freely in the car than I would lay a baby in the seat unrestrained.
Some people may feel that it's okay to leave the dog free to roam around because they've never been in a wreck. It just isn't going to happen to them. If that's the case why do they wear their own seatbelt? Why do they insist that others fasten their belts? Why do they buckle up the grandkids?
You do your dog no favor when you don't make at least some effort to restrain them. IMHO.