I think that we all meet conscientious dog owners more regularly than we realise. It's just that their dogs are well behaved and do we don't register them. Just the same as with children, it's always the poor behaviour/rude mannered encounters people remember.
I don't allow my dogs to approach other people or dogs as I appreciate that not everyone is a fan.
I don't understand the hysteria in some posts - what germs have dogs passed on to people? As far as I know there are not many zooetropic diseases passed between dogs and humans, though people with some autoimmune diseases do need to be careful around bird, cat and dog faeces. My (in some posters opinions) filthy, unhygenic, slobbering, shit and piss producing, hair shedding stink monsters dogs have never had fleas, ticks or worms never mind shared them with me. DD, on the other hand has managed to pass on nits on a couple of occasions and DS kindly shared his chickenpox with me. Filthy creatures 
I have every sympathy with people with allergies - I have, amongst others, an allergy to long furred cats and dogs as well as to lanolin and to wool and the fibres it gives off. Going out in winter is no fun - hats, scarves, overcoats, jumpers all trigger an allergic reaction. It's frustrating but it's my problem to deal with.
Dogs and humans have coexisted for centuries. They've been domesticated for a reason. No-one has to like them or have one, but like many things on earth, they exist and as humans we need to learn to co-exist with them and appreciate them for the help they give us.