It's not other people's job to jump through hoops to meet your chosen metric, apparently defined in ignorance of the facts. The crowd left the Capitol because Trump eventually put out a video statement telling his supporters to go home, well after the Senate chamber had been evacuated and taken over by rioters.

Testimony from within the White House indicates a large number of people worked to persuade him to issue such a statement, perhaps convincing him that he would not have the support of many cabinet members of aides otherwise. We can only speculate on what might have happened if he had told his supporters to stand their ground.