Skepticism, unlike criticism or doubt, is a positive set of methods for examining reality. We should always fearlessly compare our ideas to external, objective data... that is unless of course we worry our views may be incorrect. Our goal should be to reach conclusions that are true, not just ones we wish were true. Humans are subject to delusions, which is to say we sometimes create our own reality - outside of what is really there. A common manifestation of this may be seen in public panic. It is correct that not all reasoning is valid, but you still must take responsibility for your own thoughts. Thinking critically is a process, and the first inherent component is examining all facts you assume are true.