But it could win them more local elections, and then we get fuckery like what’s happening in Florida and Texas all up in our business.

Local elections matter too, and often more, than national ones.

Yes sabotaging elections via fire bomb in ballot box is not a rational action.

It's probably some terrorist asshole LARPing as a freedom fighter thinking they are "sending a message" more than actually trying to directly sabotage vote tallies.

Both states in these areas have toss-up Congressional races. They could decide control of the House.

I read elsewhere that one of the locations is in a district with a competitive House race.

Chaos makes a coup easier.