The reason is quite simple. NPR is trying to keep its free money. Anything that could be used against them in the case of removing their funding will qualify as a terminable offense. Conservatives are not shocked/offended, but they would like to remove the tax payer funding of liberal editorializing, and they will use NPR’s own words to hang the organization. I think it has very little to do with offense. If your employee jeopardized your free money, you would can her too.