Attention seeking chav mothers who didn't even know the child, but they see someone leaving a cheap kids toy and feel compelled to be a sheep and do the same, hoping to get their mug on tv/in the paper.
Similar to the distasteful way some people 'decorate' children's graves with toys, trinkets, wind chimes, toy trains, toy cars etc......aka a pound shop grave
A graveyard is not the place for all that crap, people visiting loved ones graves who want a quiet moment don't want to have to look at the next grave which is garishly decorated and whose wind chimes are making an unnecessary racket
Flowers not tat are appropriate for graves
http://i.dailymail.co.uk/i/pix/2011/02/01/article-1352498-0D00B230000005DC-853_634x398.jpg