Setting aside your subjective opinion about the state of the US's government, the Schengen area includes countries such as Slovakia and Austria. Apparently there have been no wave of Slovakians migrating into Austria despite the gap between their living standard, political transparency or corruption level. Hungary and Austria for that matter, or Poland and German. The agreement is only about open border. Nothing else.
You clearly fail to understand the statistical differences in health and safety between those countries if you think they’re comparable to the gulf that exists between Canada and the United States.