"Any thoughts on why Fetterman said this in his interview?"

Because as James Carville once said, "PA is Pittsburgh and Philadelphia with Alabama in between." You know how popular Trump is in Alabama, in the South in general, so it shouldn't suprise anyone that Trump is popular in a wide swath of PA. As for the intensity of Trump's support among his MAGA base, I see it here in this red county (starting to trend purple) in NY where I live. The house across the street has a Trump flag and two Trump yard signs. Another house in the neighborhood has two Trump flags and two Trump yard signs. A couple of other houses have really big Trump signs that stretch across the whole front of the house. A few months back one house hung a long sign across the front porch that read, "---- Joe Biden."

There are Harris signs in the neighborhood as well. Most houses have one, maybe two yard signs, but I haven't seen any large Harris signs or any Harris flags. There was some yard sign drama in the neighborhood recently. At the entrance to the neighborhood there is a brick wall with grass in front of it. A few weeks ago there was a Trump sign and a few other signs, Democrat and Republican, for lesser offices. Then a Harris sign appeared. One day later it was knocked over. Someone put it back up, and then the next day it was not just knocked over but broken so that it couldn't stand up anymore. None of the other signs were touched, including the Trump sign. A few days after that someone put up four Harris signs, grouped together so they are touching each other and pushed them low to the ground so they are harder to knock down. Every day for the past week or so when I leave the neighborhood I check to see if the Harris signs are still standing. So far so good.

All that is just to say that, yes, Trump supporters in general have a certain intensity, at times laced with anger and belligerence, which is why I say they are the ones with TDS.

Here's an interview with a Democrat in a Republican ccounty in PA talking about how liberals get harassed at family gatherings that Fetterman posted on his X account:

PS Robson, do you live in the Alabama part of PA?

And another item of high interest is the Amish are now so enthused about Trump that some of them are even voting and having Buggy Road Rallies for him. I want to tell Fetterman about this new wave of enthusiasm that has never happened before.
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#8 | Posted by Robson

Be careful not to overhype the Amish vote for Trump because it appears that some election interference regarding that is being investigated:

PA officials nvestigating 2500 voter registrations for fraud

Officials in Lancaster county, Pennsylvania, are investigating about 2,500 voter registrations after election workers discovered signs that they may be fraudulent.

Truly horrific is more like it.