It's not realistic to put men on the moon.
It's not realistic to expect us to defeat Germany, Japan AND Italy.
It's not realistic to defeat the USSR in this Cold War.
It's not realistic to dig a canal from the Atlantic to the Pacific, it's too hard.
It's not realistic to build a railroad from coast to coast, it's just too hard.
Maybe if the politicians had not sat on their hands the past 20-30 years it wouldn't be so hard. How about this --- earn your dang money and get the job done!!
I'm glad the leaders of the US and Britain didn't decide it was not realistic to deport the Nazis from Europe and the Japanese from the Western Pacific.