It's hard to run a convention when you have to mollycoddle Jew-haters, pedophile sympathisers, and people who have made abortion their religion, because you need them to turn out for you, but you also know that if normal people see you mollycoddle them, they'd never vote for you in a million years. In the past, they were able to walk this line, because the freaks knew they were politically toxic and didn't mind staying in the background so long as Democrats dutifully nominated federal judges and agency heads who were sympathetic to the freaks' agendas.
Now the freaks think they're the majority because everybody they know and surround themselves with are also freaks or at least pro-freak. So they expect to be "affirmed" and "validated" by their politicians. That's makes the Democrats' job harder.