Rationality can be arrived into by rationality. This is right, and this is why I'm doing it.
Some people reach the jacket of rationality for completely different reasons:
1) bad intuition / irrational nature.
Most people don't practice strict rationality. But there end up pretty much rational in multiple ways. Social learning / imitation. Or listening to some teachers. Or using life experience and emotional reaction to teach pretty much rational directions.
If someone is failing in some of the above, he might have to use aggressive "rational" rationality to get his life in order.
2) a tendency to be rational. Sometimes an obsession, sometimes loving it, etc.
NOTE route / outcome confusion.
I've noted elsewhere that we intuitively mix-up the way how people get somewhere, with its desirability.
This is a huge mistake.
However one ended up with the rationality habit, it's outcome is what matters, not why and how he got there.
(Outcome, of course includes experienced effects age utilitarian results!!)