"Men should not cry"

My interpretation - It's a statement to make men mentally and emotionally strong - which is the need of a stable society.

It's not to make them feel like their emotions doesn't matter or they have to be emotionless.

It's a long life, no one can live without expressing emotions but there are ways to express them in a healthy way.

You can't just burst on a street or you cannot use your power over a weak just because you are in a hike of emotion ( what most emotional unstable men do).

Men are more dangerous when they are in control of their emotions, especially the emotion of anger, resentment and revenge.

Why? - because they have the strength. And when strength combines with negative emotions it only elicits destruction.

Along with that, women are too emotional and are easily inclined to emotional instability which also due to their biology So, we cannot put the load of the hardship and accountability of family and society on their shoulders.

Whether men are naturally gifted with more logic and lesser emotions(as compared to women) so making them strong, accountable is much easier and healthier for a society.

Men should express their emotions

In a way that makes them feel good and society stable.