I don’t think he was ever any less serious in forging peaceful coexistence, and that he didn’t need an island to genuinely mean it either. Then again, even Martin Luther King, whom I’ve seen been compared to Professor X many times, arguably helped achieve more productive progress in getting oppressed black people reasonably integrated into societies with white people relatively more quickly, in spite of all the atrocities that had been committed against black people, than Professor X did for mutants.