The problem with current cycle campaigns is that they are antagonistic and adversarial to motorists. The approach is to improve matters for cyclists at the expense of motorists. Surely the goal should be to improve the roads for ALL legal users? If approached from this stance then there would be support from motorists instead of resistance.
If cyclists organisations entertained motorists belief in their fundamental human right to drive/ride then the same would be reciprocated. After all, cyclists have no more moral or legal rights to the road than any other user.
I'm not sure which campaigns you are referring to as all the ones I've noticed recently have been very much the opposite, actively trying to build relations with motorists. Yet the stereotype of the militant ant-car cyclist is still constantly bandied about in an attempt to justify aggressive behaviour towards them.