He might have considered completely wiping his trust (both negative and positive) as the right thing to do, and your own position (or assertions, or whinings) may not have played much of a role in his decision, except perhaps reminding him that he should consider whether to wipe his trust or to just leave it in its latest state.  He could have gone either way in regards to that, and maybe if I am second guessing him, then it may have been better for him to wipe since he said that he was purposefully leaving the forum based on his own assessment of his short-time line left in this world... but if he had not announced anything, then maybe the better thing would have been to just let the trust list stay in its then current state-of-affairs...

There is another theory that maybe you bullied him into doing something that he probably should not have had done, but none of us can really completely know anyhow, even if o_e_l_e_o (Leo) might make one more post explaining why he chose to completely wiped his trust list..