Maybe they are too busy preaching the Kingdom is already here and God set them up as the choosen people in the court of the kingdom. Kingdom Hall. The saved. They must be clean by not practicing sins.
Also, Jesus is getting ready to stand up to bring on the wrath of God's Day,Armageddon to put in end to the "lost!"
So you are preaching the same when you stated,A person is either saved or he is lost, either entirely saved or entirely lost. I leave it in Christ hands to judge. I am a sinner and I know it whereas some want to pretend they are in the entirely saved group which no one would know that one but only the Father not even Jesus.
But it was a good point.