Shavua Tov. Rabbi Soloveitchik compares the actions of Pinchas to World War II. Several countries chose the path of pacifism rather than get involved and join the war effort.
There are times when action must be taken. Countless lives were saved because of the Allies and the results of the war.
Pinchas demonstrated that there are times when inaction is wrong. In order to achieve something, we must sacrifice. This is true in many different areas of life.
We sacrifice our work time in order to be with our family. We sacrifice our capital in order to make money.
It certainly is easier to be passive and do nothing. But if we want to accomplish anything in life, we have to work hard and rise to the occasion to do what is necessary.