Does ethical PR exists only in NGOs?

Since we started our Contemporary Theory in PR class I often catch myself thinking about ethics in public relations profession. The more I read about PR work for corporations and governments the more I thought that probably only NGOs and public relations for charities can be ethical.

But recently my thinking diverted from that preliminary thought. I still don’t actually have a simple yes or no answer to the question whether only NGOs or voluntary sector can practice ethical PR (answers to questions about ethics and morality are hardly ever black or white), but I have a broader idea of what methods NGOs use to influence people. And they not always are fair play.