Should I bring up the Oslo accords?!
I see no relevance, besides your attempt to incite, but go ahead. If you can figure out what he did wrong, explain. He paskened that in a case where giving away land will save lives (at least that's what he was told would happen), give away the land. There was no precedent to foresee that it wouldn't save and would actually cost lives. As they say
אין לדיין אלא מה שעיניו רואות
Once it was clear that the Arabs cannot be peaceful, the factors involved in the original psak had changed, and he was strongly against any future concessions. No, not a lefty, not a righty, only the Torah way. (Note there is more than one way to Torah)
PS. It may be more appropriate for you to start a new thread, maybe something like "Why I love HaBayit Hayehudi" and continue the discussion there.