Why do managers break bad news on a Friday afternoon? What do you think to this method?

I’ve worked a few jobs where my managers waited to Friday afternoon to break bad news. On Friday at 2pm my office was invaded by higher management to tell my team they would be investigated for misconduct. None of us have been placed on suspension so after ruining the whole teams weekend after they all worked last weekend and had worked 13 days in a row seems pretty poor play. Specifically when we have a team meeting they could’ve broken the news in Monday morning. I find it really spineless. Why Friday afternoon?