This is not reasonable. Everybody should know enough first aid to deal with a heart attack until EMTs get there. It's not that hard, the course only takes a couple of long days. Dealing with every variety of mental illness is orders of magnitude harder. Social workers have master's degrees, not a certificate from a 2-day course.

Just let cops figure out how to do their regular jobs right, rather than making them the first responders to an embarrassingly terrible social safety net.

We don't have a choice, cops will be first on the scene. If nothing else because until they arrive nobody even knows to call in someone else.

The police have more complete first aid kits than the average person, including such things as an AED. They also get a bit more than your standard firstly aid course.