Why change the past?

As we begin to read Shakespeare's Richard the Third we are faced with this hunchback nephew killing England king. Richard the Third is portrayed as this evil man who has no heart. But is he really like this? We know from reading the Daughter of Time that Richard isn't this evil man that history claims him to be. So why is poor Richard portrayed as is this evil villain? This is because people like to change history for their personal gain. Henry Tutor portrayed Richard as an evil guy to make himself look more powerful and kind. I don't find it hard to draw a comparison to our current leader Donald Trump. Trump accused former president Barrack Obama of not reaching out to families who just lost their sons in an ambush in Niger. Trump bragged about writing all the families and flying out to see them. He tried to make Obama look like he didn't care about the military and was a selfish guy. Obama did actually write letters and visit the families. This shows that no matter what time period rulers will try to change information for a better image and to make the last ruler look evil.