Oscar Isaac did an interview recently where he revealed that line was added in reshoots. So that line was written in an attempt to fix whatever catastrophic wreck the script was in before then.
I'm imagining some writer going "wait a minute, did we ever explain why Palpatine was back?" And then writing that and leaning back with a smug "whew. Nailed it."
These things shouldn't be torn down. Relocated, sure, but Americans need to remember what they're capable of. Maybe put them in some kind of Smithsonian Museum of American Failure, along with all that Confederate statue spam.