A few things spring to mind:

• The chart excludes people with no opinion so it's difficult to tell the magnitudes the chart is showing.

• The chart excludes people without health insurance so you're looking only getting an incomplete picture of what's going on.

• More importantly, there's zero ability to cross reference this against who has had to actually use their insurance. I'd wager that people with a negative opinion have had to engage with their insurance for more than a physical.

• Aren't people over 65 qualified for Medicare? Interesting how there's a sudden jump in approval.