They are pushing this because they know once they achieve this end - that New York, Boston, Chicago and LA will decide who "wins" a presidency and the rest of "flyover country' becomes totally and completely irrelevant, without any voice in the political process whatsoever.
By design of wannabe tyrants and knowing that the imbeciles that make up their vast constituencies will buy and advocate the nice-sounding argument about the 'popular vote'.
Then it truly will become 5 wolves and a sheep deciding what is for dinner.