They discovered that our dimension's abundance of cows makes for an excellent organ harvesting operation without having to risk breaking any laws in their dimension.
The puppets puppet their "puppeteers". All the acts? Well, plausible deniability and honestly, they enjoy entertaining as a hobby anyway.
Sesame Street is the biggest operation by puppets engineered during television's rise to ease children into the understanding of who really runs things.
Oh and regarding children's shows with "people in suits", sure there are people in them, but they're being run by the "suits". That was a whole new advancement in the puppets' technology.
I have relatives who just took a trip to Florida. They were rebooked about five times on their way there and on their way back. Both ways, they were stranded somewhere overnight. Both ways, they kept having to get off planes before takeoff cause of "mechanical issues". I think, due to recent political upheaval, airlines are dicking with people to discourage international travel.
Political commentary talk shows on network TV studios spewing far-left and far-right rhetoric are especially designed to make viewers not listen for that hour. That's when studios do all their cleaning, etc. The studio has to be vacuumed sometime, after all! If this sounds unlikely to you, look at it this way: do YOU know anyone IRL who actually sits down and watches any of those shows? I thought not.