newhere – the meaning of the words ‘yimach shmo’ contradicts the fact that he merits Olom Haba. Every Jew apart from some exceptions (and a murderer is not one of them) merits Olom Haba eventually. This is also clearly stated in the mishna in Perek 6 of Sanhedrin.
Similarly re Ben Gurion: I heard b’shem the Chazon Ish that he too will merit a portion in Olom Haba (again I suppose eventually) for exempting yeshiva bochurim from the army. This too would contradict the wish of ‘yimach shmo’