They're trying to destabilize the country. One side hates Trump, so he "supports" Trump. The other side hates Bernie, so he "supports" Bernie. Regardless who wins he has sown the seeds of more division. As long as we're too busy fighting each other over meaningless bullshit we aren't working as a united country. Just look what allegations of russian support have done to the country in just the last 4 years, despite investigations saying that support didn't actually change anything in any meaningful way. People falling for russian psyops like it's in style. Mueller report actually stated that Russia interfered to try and support Bernie's campaign in 2016, too. They're just doing the exact same thing expecting to get the exact same results, and so far it looks like we're all too happy to do their dirty work ourselves.