between a country and a person,

the difference between a country leader and ordinary person in this country,

 the difference between a country's interest and a person's interest.

In human history, if you dare not to go to war to kill the enemy, you would be surely killed by your own countrymen.

There is an expression, called "Nothing personal", expecially for a war between 2 countries.

According to your logic, Mao Zedong shoud have carried a gun to go to the battle field to kill the enemies himself, or he should not issue orders to let other people to kill.