Albert was not at all surprised that the Ministry of Magic had formally put Umbridge on trial. Harry Potter deserved most of the credit for it. At Albert's prompting, the young Boy Who Lived had seized the best opportunity to be interviewed by reporters and dealt the Ministry a vicious blow, forcing its politicians and bureaucrats to abandon Umbridge.
Yes, abandon her.
Although Umbridge had done a great deal of terrible things, she was ultimately only an executor acting under Fudge's instructions. In essence, she had been working for the Ministry of Magic, and she should not have borne full responsibility for it.
But once such matters were exposed, they would cause irreparable damage to the Ministry's credibility. Besides, in the eyes of most politicians and bureaucrats, abusing one's authority was not really such a serious matter.
Umbridge was an old hand at the Ministry, holding high office and considerable power. She was competent, knew how to flatter people, and after Scrimgeour took power, he would naturally not have dealt with her in order to better control and stabilize the Ministry. Scrimgeour also had far more pressing matters than Umbridge to deal with.
After Albert's meddling, Harry Potter had flipped the table outright. As the currently most influential Boy Who Lived, he was showing signs of guiding public opinion against the Ministry of Magic. For political reasons, Umbridge had naturally been abandoned. Otherwise, who knew what Harry Potter might tell reporters next, or what might happen afterward?
As for the Ministry deliberately scheduling the hearing for the weekend and inviting Harry Potter as a witness, that was merely formalism. While convicting Umbridge, they could also win Harry Potter over, demonstrate the Ministry's fairness to the public, and bolster its credibility.
But Albert found all of that laughable. If Harry Potter