I would be concerned about any government teacher who makes sweeping black/white/absolute assertions about anything. Government and politics are complex, someone who teaches the subject needs to be able to appreciate and help students understand that fact. We've got a whole nation of folks who mostly seem to be incapable of actually listening with an open mind to the thoughts, opinions, and reasoning of someone who disagrees with them--teachers shouldn't be further encouraging such narrow mindedness (which exists in equal measure all along the political spectrum).