It usually starts with “why don’t (didn’t) they just ____?”
(1) There’s a complicated situation. (2) There’s also an easy and obvious “answer” to the problem.
“Stop using carbon-based energy!”
“Tax the rich / Feed the poor / ’til there’s no rich no more.”
“Pay teachers more.”
“Teach the unemployed to code.”
Is there a name / label for this sort of simple-minded “solution”?
Simple-minded solution might be the winner. Runners up could be: reductive, facile, unsophisticated, sophomoric, and facile.