Are Americans afraid of Canada or Greenland because it appears quite large on a Mercator map? Are we more likely to send aid to Asia because it is in fact a larger continent than Africa?
You think voters will increase support for Africa (whatever that means) if their perceived size of the continent is increased?
You're not going to get a rational answer to the question.
Noted very stable genius Donald Trump: "I love maps. And I always said: 'Look at the size of this. It's massive. That should be part of the United States.'"
It's not totally implausible that the grossly oversized depiction of Greenland on Mercator (it's shown as being larger than the US) actually had some impact on his asinine desire to annex Greenland.