Who says Morris is not dangerous? My son once nearly had his eye taken out by a large lump of wood which broke of the end of a morris dancers stick and passed and inch from his ear. When I complained afterwards the dancer cheerfully replied "Oh it's alright- we are insured for that sort of thing"
Also public places are just that- places used by the public and not everybody (probably about 99.9% of them) wants morris dancers ruining their peace and quiet as well as risking injury. I agree with StevetheORC about Hastings on May Monday. One side were even blowing fire at the onlookers!