The Bishop has the authority, no argument there. I won't even criticize him giving Kennedy a Catholic mass and burial. I don't have any idea of the state of Kennedy's soul, nor do I know for sure that a public letter repudiating abortion wasn't written; one may have been and withheld by the family at the request of Obama.
But the Kennedy family knows the rules of the Church, and used their power to put on a spectacle contrary to the wishes of the Church. I think they owe a lot of people an apology, including the Cardinal.
Given the scandal, and that he was neither a president nor a faithful or loyal Catholic, there should not have been a public funeral officiated by bishops. There is nothing wrong with any layman in the pro-life movement voicing disapproval. What does this have to do with Canada though?