Why1?

Here we go my first why? Why do children scream so much - when I was a lad (during the 1960's) the only time you heard a child scream was if they were in real trouble or getting a good hiding for something they had done. These days children seem to scream constantly - do they not realise that thsi has led to people taking no notice when they hear a scream which means if they were in real trouble no one would know!
I was going to say answers on a postcard - but I would prefer comments via this blog - look foward to hearing from you, especially if you can answer the question!