Do you think it is a coincidence that this nonpolitical workplace thing is catching on right now, and not, say, 30 years ago? Nobody was calling for a nonpolitical workplace when the issues at hand were sexual harassment and equal pay for equal work. If there were some hiding behind that, they certainly didn't have a critical mass of support behind them.
The problem isn't so much that people bring their ethics to work as it is that busybodies bring their moral crusades to work and demand that everybody join their cause or be labelled a bad, bad person. I, for example, have taken my ethics everywhere I have gone every day of my life. I have a rebellious spirit. I think rules in jobs like banning tattoos are stupid (even though I have none visible). I think dick in a suit dress codes are hazing and counterproductive. What I have not done however is send out an email chain to everyone in my office demanding that my CEO be fired for not doing a press conference on the plight of the furry fluidgender otherkin in Tanzania.