Why was the entire staff of the school in LA replaced?

The Los Angeles Unified School District is replacing the entire staff of Miramonte Elementary following (10) the arrest of two teachers on lewd conduct charges last week, Superintendent John Deasy told parents at a meeting Monday night, the Los Angeles Times reported.
    Positions will be filled by qualified teachers and other workers already on a placement or rehiring list, the Times report stated. But the displacement of the current staff could be temporary, according to the report.
    Teacher Mark Berndt was charged last week with committing lewd acts on 23 children. Another teacher, Martin Springer, was arrested Friday on suspicion of fondling two girls in his classroom.
    Deasy said staffers are being replaced because a full investigation of allegations is disruptive, and staffers require support to get through the scandal.
    There will also be a psychiatric social worker in every classroom to help students and staff cope with any issues that need to be dealt with.
    Parents will also be given the option of transferring their children to one of four elementary schools in the area.
    More than a quarter of the students at Miramonte Elementary School were absent on Monday, with attendance reaching just 72 percent, according to figures from the Los Angeles Unified School District.
                                                                    NBC News