I know there will be a lot of "Fuck him, he was an idiot for voting for Trump" comments, but this is a sad case. This guy's son died of a heroin overdose, and like a lot of people who experience a personal tragedy he turned his grief into a mission (think of people like John Walsh and Patty Wetterling). His goal was to get help for others with opioid addictions, and he believed Trump's promises that there would be funding for opioid treatment programs. Moss' faith in Trump because of this particular issue was so great that he sold his construction equipment and stopped paying his mortgage in order to finance his campaigning.
One might say that level of faith in any politician's promises would be misplaced, since campaign promises, even those made sincerely, are merely aspirational. If you follow politics you know even your favorite candidate can't follow through on all of those promises because of political realities, but at least you know those issues will be promoted and supported. This man seems to have been pretty naive about politics, or at least he was blinded by his devotion to the issue of drug addiction and desperately wanted to believe Trump really would follow through. It's doubtful that very much else really mattered to him. Trump, of course, is a con man who had no intention of following through unless it was politically expedient for him to do so.
So, Kraig Moss sunk everything he owned into the Trump campaign because of his intense desire to do something about the addiction that killed his son, and Trump conned him, like he conned so many others in one way or another. I hope other Trump voters who see that story can finally figure out what many of us already knew about Trump.