why can't nav let me decide if i want to delete a file it thinks suspicious.?

why can't nav let me decide if i want to delete a file it thinks suspicious. it deletes and no restore option. sometimes a restore option. why not always? my sub is up soon nav is going off my pc.. nav folk must think i have nothing to do only redownload legit files it deletes#

i know about exclude. that is AFTER it is deleted