yea us F's keep people from eating their own poo...
wait... I don't get it...
Because Feeling is the only thing that would motivate a person to not starve to death in their own filth. I didn't say that Feelers kept other people from doing that. I said the presence of Feeling processes in any human being is what keeps that person from doing it.
This is always a little hard. Describing one process is hard because every process needs to work with another one in order to make any sense at all. So, I can't describe Ti for Fi with an example that doesn't require other processes to be used... But, let's see...
Let's say you're thinking about eating salt. When you apply Ti to that prospect, the Ti is only going to think about the factual properties of the salt. What is salt? What chemical poperties does it have?.
Assertions like "I don't like salt" and "salt is bad for me" are Fi assertions. They are based on your sentiments about salt, not the literal properties of salt.
Now, if you're astute, you've probably noticed that both functions would be pretty useless without the other. Without Ti, you wouldn't know anything about the salt to even have a Feeling about. Without Fi, you wouldn't have any opinion about salt, and you wouldn't do anything with the information you possess regarding salt.
So, of course, ENTPs do have Feeling, and ENFPs do have Thinking, but each types will give
priority to their letter, in terms of what they will use to rationalize their decisions.