JWs don't go to war, not because they are pacifists, but because they consider themselves citizens of "God's government" and thus cannot serve in another government's army. If Jehovah recruited them in His armed forces, be sure they would sign in and take the sword to slain unfaithful ones. Jehovah's Witnesses "of old times" (i.e. Israelites) did just that, when they (so the myth goes) conquered Canaan. Besides, they expect from Jehovah's "government" to bring Armageddon, which is a total war, as total as it can be, and bring the violent death of about 7 billion people worldwide, the 99.9% of the world population. ALL JWs expect that, and almost all are comfortable with that. Is that their idea of "hating war"? Ridiculous claim.
As for the preaching stuff, a load full of Christian denominations do more or less the same thing: Door to door (Mormons), handing leaflets, tracts, brochures (almost all of them), web sites, TV stations, TV net broadcasting, the list is endless (and valueless).