They're skipping it because they know that being a serial liar, using dog whistle politics, attacking minorities, making fun of the disabled, being unable to withstand any and all criticism, wanting to unilaterally jail your opponent, and likely being funded / blackmailed by the Russians, is a bad thing. And all this before he's even officially in the job. A lot of serious negatives there. And its a high price to pay for any of the good the man may do while in office.