The tendency to believe falsely, after an outcome of an event is actually known, that one would have accurately predicted that outcome is known as a(n) bias.

hindsight          

Explanation:

In psychology, hindsight bias is defined as the tendency of a person to "overestimate" his or her capability of predicting a particular outcome that couldn't have been predicted in that way.

The hindsight bias tends to affect a person in a manner that how recently he or she has acquired specific knowledge related to something that eventually influences the recollection of his or her past information. It can often lead to developing "false thinking".

The question above describes "hindsight bias".

well, i can't read it so i'll ask you questions about it : )

if you were a reader and you read the introduction, would you want to read more?

does it start with a question? if so, is it something you would want to read about?

and ask any friends or family for their opinion : )