Lama Ole’s answer:
If you act with anger, then the result can’t be love, peace, and harmony. Anger is toxic. It is only when the ego doesn’t trust itself that it thinks it has to act with anger.
You act much more effectively without anger. Your actions are stronger and better when you act out of compassion. Then you are much smoother; you see precisely what is there and you get your results. Outwardly, you can put on a powerful, angry appearance, but inwardly you must not be angry.
Many young people come to me asking for a certificate that says that as Buddhists they cannot become soldiers. I cannot support this; I was a soldier myself. If there are no soldiers, then who will protect our society and our freedom? We actually have our freedom only because we had enough soldiers. You can very well be a Buddhist and protect your country. You just mustn’t be angry while you do it.