This is a topic that has fascinated me recently. I looked up over 20 different translations (english and spanish) of Matthew 24:39 on the biblegateway website, and the texts disagree with how the Watchtower translated this text. From the WT point of view, they like to state that the people were warned but no one wanted to listen. But in the translations I read, it seems to me that the people in Noah's day had NO IDEA that the flood was coming! I even re-read chapter 6 and chapter 7 of Genesis, and nowhere do we find that God commissioned Noah to preach.
I brought this up to my mom, because of the recent Noah Watchtower article (I think it's either May or June), and she was confused at first. She says that there's a text in the bible that states that Noah preached for over 120 years! I was like, "What??" I asked her to find me the text, but she says she couldn't remember where it was at. (I can bring up these kinds of things to my mom, she won't turn me over to the elders). I even pointed out that the Watchtower writes that Noah preached, but there was no text to back it up. It's things like this, when the WT says something and then they fail to back it up with a text, that really piss me off!!
Check out a couple of translations:
New Internation Version " 39 and they knew nothing about what would happen until the flood came and took them all away."
The Message "They knew nothing—until the flood hit and swept everything away."