It was on -4 before I made the edit, now it is on +10. So I'd like to think that the edit at least helped some people try to be a bit more objective which is always beneficial. Or it could be a coincidence.

I think it's just that people get caught up in tribal thinking very easily, and while the commentators on this site would usually be interested in discussion on the comparative advantages and disadvantages of free trade, Trump's message on protectionism have driven some people into a corner of having to be anti-protectionism to remain true to their 'tribe'. It's pretty unfortunate how quickly we as humans can fall into a trap like that: "I hate person X, person X believes Y, therefore I don't support Y".