"For as the days of Noah were so also shall the coming of the Son of Man be". Think about this, how impossible is this prophecy if Noah never happened in the first place. How can the end of the age be like the days of Noah if there never was a Noah? Yet 2,000 years later there is a very clear comparison, not with the age of Noah, but with the "Days of Noah".
What were the key days? Surely the day that Noah learned that there would be a flood and that he needed to build a boat. Then the day when they all entered the boat, the day when it started to rain, etc. We also have had that day where we realized we are in the midst of the 6th great extinction, and there was the day we began to build the ark, a seed bank to try and preserve all the creatures DNA, etc.
You can argue about whether or not there was a Noah's flood, but without the boat you will never conclusively prove this story was true. Likewise, no one can conclusively prove it was false. I see no harm in those who are actively searching for evidence of the flood, on the other hand I do see harm in those who assure everyone that it never happened. Wanting to see evidence is one thing, but assuring people that it never happened when time and time again your "logic" turns out wrong is just darkness. But what is most important to me is that it is a harbinger of the end of the age.