If you can radically change your political views like Fetterman has, based solely on a personal experience and not logical argument, then you never had a rational basis for your new views.
Even if everything Fetterman said was true, it's still damning.
Also, he was elected based on the views he professed at the time of the election. Even if he personally changes, he still owes it to his constituents to act like the person who they thought they elected. It's like he doesn't even understand the most basic principles of representative democracy.