Well, how about juvenile suicide? ten times as prevalent as measles, even with the spike (30x as prevalent in normal years)
Or automobile safety - about 30x as many kids die in cars accidents than from measles.
Hell, "natural causes" account for 200x as many deaths as measles...
How do you prevent "natural causes"?
Even with motor vehicle accidents and suicides, these are groups of causes, measles is a single cause. You should really be comparing suicide with all viruses or at the very least all viruses in the Paramyxoviridae family.
Further more, the only easily preventable cause you listed would be motor vehicle accidents (as someone who's worked on a suicide hotline, they are not easy to prevent) and the mortality rate from using motor vehicles would be nowhere near as high as contracting measles (15%).
So yeah, there are more important things to worry about than measles.
Yes, but this is only we've had a working vaccine for long enough that it's been virtually eradicated from our society.