Why do all colors have a description to them?

Red- For strength or anger
Yellow- For sunshine and happiness
Pink- For all girls
Blue- For the boys and for when you're sad
Black- For hate and fear
Purple- For luxury and ambition
Green- For nature and energy

We force people to be someone by giving them a label.
Should we do that to colors too?

Why should black be the evil one?
Why can't yellow be a way to express sadness?
Why is pink for girls?
Just why?