Teaching believers that we should not be watching for the Lord's return is demonstrably false doctrine. Paul was in Thessalonica for a few weeks and taught them about the rapture. When asked Jesus gave extensive exposition on the signs of his coming. Paul talked about a crown for all those who love His appearing.
The teaching that no one knows the day or the hour and therefore they don't need to watch is also demonstrably false. Every time the Lord said that He concluded that therefore you need to watch. The examples He gives is of a farmer not knowing the day or the hour to harvest, hence he has to watch. A woman doesn't know the day or hour the baby will be born hence she needs to watch. You don't know the day or hour a thief will strike, hence you need to watch.
Also, no verse is of its own interpretation. When you couple those verses with others like Revelation 3:3 then it becomes obvious that although no one knew the day or the hour 2,000 years ago there is no expectation that true believers will be caught by surprise by the rapture.
Now we are told that man lives by every word of God. How many pastors follow that? There are many pastors who won't talk about certain topics. The Bible talks about the Antichrist extensively, how many pastors do? How many completely avoid the book of Revelation? 25% of the Bible is prophecy, how many spend 25% of their preaching on prophecy?
The solution to not being deceived is to be filled with the word of God, but if they won't teach this word then of course people will not be filled with the word that would make them wise unto salvation.