Or an IT guy who read the newspapers that Hillary's server might have classified information on it, and as someone entrusted with the server, but not cleared for classified information, realized the best course of action was to wipe the server in accordance with military standards
DoD 5220.22-M Explained - Data Erasure Standards
The DoD 5220.22-M standard involves overwriting the previously stored data on drives with binary patterns of zeroes and ones. The process requires 3 secure overwriting passes.