Jws are not preachers or christians. They are just telemarketers with a prepackaged sales pitch who dont have an theological understanding of the scriptures.
The evangelical church grows by members just finding 5 to 10 people in your life that aren't christians and just becoming their friends. Volunteer your time , help people out and invite them to your church.
Even in countries where being a christian can be dangerous or isnt encouraged. this approach to evangelism has been incredibly successful in places like China, India, muslim world etc. There are tens of millions of people involved in the house church movement.
I have very little sympathy for the poor brothers rotting in prison because they cant bang on your door saturday morning.