Clinton absolutely had a message. Now you're showing your own bias. I'm not saying Trump wasn't worse as a person (he clearly was. He's awful), I'm saying what he was worse about was something his voters didn't care about. How many of those Sanders voters stay when they find out they get a sizable tax increase? According to polling, the support collapses quickly and precipitously. As it has, historically, for all far left candidates. While your speculation may be right, there is a significantly more sizable set of evidence that it's pretty delusional. The Slate articles above, hardly anti-Bernie as a site, lay it out pretty well.