In my opinion, those pages of the Proclaimers book are lucid and to the point, and the Bible texts listed are sufficient and clearly explain their biblical views.
True the book of Isaiah mentions that the nation of Israel were Jehovah's Witnesses. But Jesus was born a Jew and therefore, a Jehovah's Witness. Christians, as followers of Jesus, are not only Witnesses of Jesus, but also Witnesses of Jehovah. But since Christians imitate Jesus in preaching the truth of God, they call themselves Jehovah's Witnesses. (compare Acts 1:8; John 12:44-50; John 14:24; John 18:37; Rev. 1:1-2; Rev. 3:14) The book of Acts you cited allude to God several times. Acts 3:15 says that God raised Jesus from the dead, and the apostles were witnesses to that fact; Acts 10:39 talks about being the apostles being witnesses of Jesus hanging, but verse 40 goes on to say God raised up on the third day; verse 41 specifically says the witnesses were "appointed beforehand by God"; the same can be said of most of the texts you cited in Acts. The context clearly shows that Christians were witnessing about both God and Christ. Heb 12:1 is a continuation of Hebrews chapter 11 which describes the active faith of the pre-Christian Witnesses. Read the context. Notice that Abel was included in the apostle Paul historical account of faithful Witnesses in Hebrews chapter 11. It is so clear that from reading that context the even Non-Witness commentors agree. "The cloud of witnesses refers to the people of faith mentioned in ch. 11. They are not actually spectators watching us; they are witnesses testifying to the truth of the faith (11:2, 4-6)." (Nelson's Compact Series - Compact Bible Commentary, p. 902)
Are Witnesses really the oppressor? Or are they protecting or defending themselves against the oppressors? (2 John 8-11) Whether or not one may agree with all the viewpoints of the Witnesses, it cannot be denied that the Witnesses fight for religious freedom have benefited others. But that freedom also included their right to apply what they understand the Bible texts such as 2 John 8-11, 1 Cor. 5:9-13 , and others say. I know for a fact that Witness elders will do all they can do to help one adjust his or her thinking before expelling them from the congregation (which is used as a last resort). But if it is believed that some are slandering the congregation, then steps must be taken to protect it. If one truly repents, he or she is joyfully accepted back to the congregation, just like recovered lamb brings more joy to heaven than the ones that were never lost.