Maybe the better question is not "are these people to blame for the poor image of cyclists" but "Why don't cycling advocacy groups do more to educate these people on proper cycling safety and help them find suitable yet affordable bicycles to use for transportation?"
For instance, a cycling advocacy group could team up with the local court system to provide information and even donated bikes to folks who lose their licenses. Similar things have been done to get drug addicts and alcoholics into rehab programs.