What you wrote is true only in the narrowest sense: of course people “can” rationalize. People also “can” fly to the moon. That doesn’t mean that is what people are doing, and it comes across as deeply unempathetic to express as a default assumption.
I understand that people can be legitimately held back by circumstances outside of their direct control. That is also true.
I believe that on average people tend to like to take credit for their accomplishments and find someone/something to blame for their lack of accomplishments.
Ask the people who would've gone pro if their high school coach hadn't been a dick. Or who got passed over for a promotion because of work politics.
You can see the sun rise in the east. Despite what you seem to believe, you cannot see what is going on inside someone else’s head, which is essentially what you are claiming to be able to do.
I don't need to see into their heads. They have mouths and I have ears. I can literally hear people talk and not take accountability for their situations.
Perhaps internally they are taking accountability but all the evidence I have says that many do not.