It took a few centuries for the political passions to settle and for the bones to be found. He then received a proper burial ceremony. A proper and fitting ceremony for a dead king.
For a good commentary on his successor, Henry VII Tudor, father of Henry VIII and grandfather of Elizabeth I, see this.
Some of the kings of England have been weasels, main-chancers, weak, unscrupulous murderers, and traitors, even. Although Charles 1st thought that it was impossible for him to have committed treason, Parliament demonstrated to him otherwise by lopping off his head in 1647. With the passage of political leadership to the institution of Prime Minister, it is their assistants rather than kings’ minions who shove a knife into their enemies these days. The Wars of the Roses makes the resignations of the Gerald Butts and the Clerk of Privy Council seem like small stuff.