It is also often a very bold claim to say "There is *no* evidence for X." The cases where you can truly say that are rare compared to how easily people (esp. non-experts) will say it. More often, it's more accurate to say, "I don't believe the arguments for X or evidence of X."
After doing a lot of research into homeopathy we are now very confident that it does not work and cannot work.
"There is no evidence for life elsewhere in the universe."
"So you believe we're alone in the universe?"
English is poorly suited to expressing this distinction.