If I'm Zach Hudson, I do everything I can to make sure Halsey doesn't return to office in any form, because there's no way her DNA isn't swimming with Thargoid modifications, just waiting to open some door or disable some crucial defense system ahead of an invasion. Former leader of the Federation disappears for months and is the sole survivor found? No way - do not approach! Danger!
*edit - I stand corrected - she was not the sole survivor. Only increases the threat in my opinion ... imagine it, hundreds of potential agents released into the population, programmed to do who knows what?