The reason the federal government had to step in is that schools like Cornell refused to enforce their own rules. They knew he deserved to be expelled but backtracked under pressure to let him keep his visa and keep terrorizing Americans as long as he did it off campus. The way the system is supposed to work is that students get visas under certain conditions with their respective schools essentially acting as sponsors. The assumption is that if they violate those conditions, they get kicked out of school and then the visa automatically gets revoked. But because these schools have essentially created special privileges where they won’t enforce their rules against pro-terror demonstrators regardless of arrests, violence, property damage, disruptions, harassment, assaults etc., there were no consequences and the normal process was failing. The Biden admin simply refused to apply pressure on schools that receive federal funds to apply their rules equitably. The new administration is both applying that pressure and revoking the student visas of those who have clearly violated the conditions they agreed to when they received those visas.
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