Question

without girls life can't go on but still people don't value them.why

Answer 1

Some do , some don't.
I don't think it is right to stereotype men on the basis of our experience with a few bad ones.

There are some men and who sexually harass women but there are others who accompany them home late at night just to make sure they reach home safely.
There are some men who treat women like commodities but there are others who look upto their mother, sister and female friends for advice.
There are some men who get drunk and beat up women but there are others who get drunk and pour their heart out for the women they care about.

Clubbing all men in the same category would be a grave injustice to the good ones.
Chivalry is not dead :)

Answer 2

that's all because of their ego........they think that girls are nothing between them......they think that girls can't do anything.......but they were wrong.Girls are also a very important part of our society and country