Part of this stupid trend that your coworkers also need to be your friends and family. "Since I wouldn't tolerate political dissent at home, I don't tolerate it at work" kind of thinking. Probably also part of a greater trend towards Corporate Nationalism in the US.

What happened to just showing up, doing the work, then going home?

Because not all groups, ideologies, countries, cultures, and other societal divisions act in the same way?

I sell loans, why do I care about my customer's religion asks the banker, right before finding out that the Quran has specific provisions for appropriately lending and borrowing money.

Because many companies try to weaken the boundaries between "work" and "not-work", so that their employees will spend more time at work.