Appearance is not reality. Economists consider 5% unemployment to be practical full employment, in part, since a certain percentage of the labor force is constitutionally unsuited to work for reasons of addiction, disability and mental illness. Those folks are not going to step into skilled jobs, or any jobs probably. 

I see two classes of "bums"--unemployed homeless--hanging around here. People who are crazy or addicted or both, and young people who are tasting bohemian-style poverty a la Jack Kerouac and Gary Snyder, which is almost de rigeur around here, and which certainly doesn't preclude  seasonal, transient work. 

Union workers, conversely, tend to be hardworking solid citizens with homes and families. I grew up with people like that, unionized industrial workers around Chicago, 30-40 years ago. If anybody had had the bad judgement to insult and demean them as seems the norm now, there would have been serious words exchanged.