Jehovah's Witnesses' pacifism is not predicated on their beliefs about government.

In other words, human violence of all kinds, whether government sponsored or not, are evil.

Jehovah's Witness believe literally

However, I say to you: Continue to love your enemies and to pray for those who persecute you,

 

Matthew 5:44

and

Do not avenge yourselves, beloved, but yield place to the wrath; for it is written: "'Vengeance is mine; I will repay,' says Jehovah."

 

Romans 12:19

This is related to their views on government, in that human government cannot bring peace, and human violence cannot bring peace. In both cases, only the Kingdom of God is able to establish lasting peace, and we should not try to do it ourselves.

Peace on earth will come, not by human efforts, but by means of God’s Kingdom, a heavenly government ruled by Christ Jesus.

 

source

Jehovah's Witnesses' pacifism is not predicated on their beliefs about government.

In other words, human violence of all kinds, whether government sponsored or not, are evil.

Jehovah's Witness believe literally

However, I say to you: Continue to love your enemies and to pray for those who persecute you,

Matthew 5:44

and

Do not avenge yourselves, beloved, but yield place to the wrath; for it is written: "'Vengeance is mine; I will repay,' says Jehovah."

Romans 12:19

This is related to their views on government, in that human government cannot bring peace, and human violence cannot bring peace. In both cases, only the Kingdom of God is able to establish lasting peace, and we should not try to do it ourselves.

Peace on earth will come, not by human efforts, but by means of God’s Kingdom, a heavenly government ruled by Christ Jesus.

source