Of course, this happens to more people than only women, but women seem to be the primary targets for unwanted touching, aggressive 'flirting' and other forms of potentially frightening street harassment. Why is behavior...
If you are ok with your (or other peoples') kids screaming when they're not in need of help (eg playtime), at which age do you think it's no longer acceptable?
It helps some people sleep or concentrate, but it only makes the situation worse for others.
Although I understand it's useful in reducing spam, it's almost impossible for someone with problems like dyslexia to complete successfully.