By "truly inactive" I mean voters who can't vote because they're dead, no longer live in that voting district, never actually existed, or are ineligible to vote

By "truly inactive" I mean voters who can't vote because they're dead, no longer live in that voting district, never actually existed, or are ineligible to vote. If these names appear as having voted, those are invalid and might be an indication of fraud. There's the another type of fraud, of course, where people use the names of active voters. A lot of people don't vote, so yeah, it could happen that someone else just takes their place. Whatever the case, both of these "fraud" scenarios are insignificantly small compared to the ham-fisted improper purging of thousands of names, and other suppression tactics such as gerrymandering.