@ Wild_Thing asked: " "witnessing from door to door", it was to "separate the sheep from the goats" and of course, the goats would be destroyed. Has this changed?"
Yes - "separate the sheep from the goats" will be done by Jesus during the great tribulation.
*** w13 7/15 pp. 6-7 pars. 11-13 “Tell Us, When Will These Things Be?” ***
11 In the mid-1990’s, The Watchtower reexamined Matthew 25:31, which states: “When the Son of man arrives in his glory, and all the angels with him, then he will sit down on his glorious throne.” It was noted that Jesus became King of God’s Kingdom in 1914, but he did not “sit down on his glorious throne” as Judge of “all the nations.” (Matt. 25:32; compare Daniel 7:13.) However, the parable of the sheep and the goats describes Jesus primarily as Judge. (Read Matthew 25:31-34, 41, 46.) Since Jesus was not yet active as Judge of all nations in 1914, his judgment of people as sheep or goats could not have started in that year. When, then, will Jesus’ judgment begin?
12 Jesus’ prophecy about the last days reveals that he will for the very first time act as Judge of all nations after the destruction of false religion. As mentioned in paragraph 8, some of the events that will occur during that time are recorded at Matthew 24:30, 31. When you examine those verses, you will note that Jesus there foretells events that are similar to the ones he mentions in the parable of the sheep and the goats. For example, the Son of man comes with glory and with angels; all tribes and nations are gathered; those judged as sheep “lift [their] heads up” because “everlasting life” awaits them. Those judged as goats “beat themselves in lamentation,” realizing that “everlasting cutting-off” awaits them.—Matt. 25:31-33, 46.
13 So, then, what can we conclude? Jesus will judge people of all nations as sheep or goats when he comes during the great tribulation. Then, at Armageddon, the climax of the great tribulation, the goatlike ones will be ‘cut off’ forever. How does that understanding affect our view of our ministry? It helps us to see how important our preaching work is. Until the great tribulation begins, people still have time to change their thinking and start walking on the cramped road “leading off into life.” (Matt. 7:13, 14) To be sure, people may now display a sheeplike or a goatlike disposition. Nevertheless, we should remember that the final judgment of who are sheep and who are goats is during the great tribulation. Therefore, we have good reason for continuing to offer as many people as possible the opportunity to listen to and respond to the Kingdom message.
