It's the Age of Stupid, stupid
It's just more evidence that air pollution or radiation or social media or {enter your favourite hypothesised cause here} is causing a steady diminution of IQ worldwide.
BttF is one of the few 80s film productions that my kids (born around the millennium) really enjoyed, and watched more than once. (Along with The Princess Bride, oddly enough.) It stands as the ideal film-school example of perfect casting, pacing and script: not a single wasted word, every line has a purpose, and even in BttF2 it pulls off the phenomenal trick of keeping you abreast of what is, when you think about, a dizzyingly complicated plot and timeline. That anyone would consider a remake is proof, should you need it, that Joe Public is as dumb as a stump.
Considering Brexit and Trump and the general state of the world, from the citizens in the street to the rantings of a man-child in the White House, British ministers demonstrating towering ignorance on a daily basis, or the adolescent, ill-considered bletherings of Musk ... I dunno, maybe it's due to alien rays broadcast from orbit to stupefy the entire planet's population in preparation for a bloodless invasion.
But yeah: we are now deeply, darkly into the Age of Stupid.