Why should your opinion of him be allowed, but my citing the actual facts not be?
It is called being gracious. Most people do not feel the need to immediately speak ill of someone who has just passed. You highlight the good, and accept that nobody is perfect. Which means that there will be some things that you disagree with. That comes with being human. At your funeral, would you yourself be able to withstand the litmus test that you are trying to apply here, to the satisfaction of everyone on the planet?