@icing look, this is not at all an excuse for the man's horrific treatment, but it is simply not accurate to say he "did everything right" by the immigration system rules. The article states he overstayed a visa, and he's been living in the US for 2+ decades without a green card.
It only takes a few years at most for a marriage-based application, implying he probably was living in the US without legal status for over a decade, and only got his work authorization in the last couple years. It just does not take 20 years to get a marriage-based green card.
You are not going to get arrested as a European for simply visiting the US without a criminal record or prior visa violations. I'm an immigrant to the US and have spoken extensively with an immigration lawyer on this topic. The biggest risk right now is to Spanish-speakers and folks who aren't white.