ARE LEADERS ETHICAL?

I teach an ethics and social responsibility course at a University. I poll my students on various topics. The other day I ran this simple poll on 40 students:
“Most leaders I know are ethical.”
The majority of students gave a mixed response – indicating trust in leaders’ ethics was neither high nor low – but somewhere in the middle.  
<script type="text/javascript" src="http://www.easypolls.net/ext/scripts/emPoll.js?p=5878d321e4b0927926a19e81"></script><a class="OPP-powered-by" href="http://www.objectplanet.com/opinio/" style="text-decoration:none;"><div style="font: 9px arial; color: gray;">web survey</div></a>
What are your thoughts? Take our poll and let’s broaden the discussion. Please feel free to comment – Why are leader ethics not quite where we think they ought to be?