He has many reasons to promote this bullshit. First the majority of republicans who voted for him. Thinking the election was stolen from them will fire them up and be used in some way to promote Trumps cause. It’ll also keep Trump’s popularity higher. He always relied on a fired up base. When he starts a media company.... Also Trump might just get someone to ‘create’ some evidence. He has plenty of reasons to keep on lying, not least of which it’s worked before. What’s so concerning is how many believe him. It’s one thing to vote for him if you think conditions for you will be better for you while under his rule and quite another to believe his nonsense.