This smacks of inventing reasons. Certainly some people are allergic. Of the rest...
> some dogs are unpredictable ; some dogs bite ; some dogs bark ; pull the dog's ears... set the dog off
Well, hello? If my dog did or reacted to any of those, I would heavily restrict the places I thought it was suitable to take it. It's entirely on the owner if those behaviours result, anyway - presuming the dog doesn't have an advanced illness affecting continence. Once again, it's on the owner or handler to judge appropriately.
> some small kids/toddlers don't (and shouldn't)
Shouldn't? I am puzzled by this. Surely it is appropriate for all children to be exposed to safe and predictable animals, and to learn appropriate behaviour with animals? One of the training habits I have with my dogs while they're very young, is to often take them to the local school at home time, and the local town shopping centre at peak times. Puppy learns huge amounts of unpredictable small humans aren't harmful, but are very friendly if rather clumsy. Children and parents learn that puppies can be well behaved and trained too, and don't react at all to having ears pulled...
If there is a parent obviously uncomfortable with the large puppy, well I keep the dog away from those folks. It's not compulsory for everyone to like animals or dogs, or to come over and pat it.
> large number of dog owners are irresponsible
That's the problem, and should be the target of any corrective measures and restrictions.
That all said I am a bit puzzled with taking the dogs everywhere. Some pubs welcome dogs and I might take them there, shops don't, so the dogs don't accompany. As is described in this thread just doesn't happen in the UK. A couple of small employers have welcomed dogs in small amounts - because someone senior had a mutt, nearly all workplaces I've encountered don't.