Again I think it is a matter of education. When people feed the birds bread they think they are helping, as well as it being an enjoyable experience.
I used to love to take my children to Windsor to feed the swans on the Thames, there were even shops there selling bread specifically to be fed to the swans.
I don't think that you will ever be able to stop people feeding the birds but perhaps if it became more widely known that bread was unsuitable for birds (in the same way as bread/milk has for hedgehogs) a pelleted food suitable for wildfowl might be substituted. On a better diet the birds might be better behaved - it is not just humans that get a sugar rush from junk food!
Thank you for your post James_Owen, it was well put and most thought provoking.
