Well Bob, here in the UK we have a system of testing. Many venues, local authorities, organisations and groups spend thousands of pounds each year on testing EVERY piece of electrical kit and every piece of connecting cable. Some people use outside testing companies, some do a course and buy a tester.
In the past three years, since I've been testing I've had 27 fails. Just 3 of those involved missing grounds - out of probably 200 tests. None killed me. That, however, is not the point.
Removing a safety ground is stupid, and an accident waiting to happen. In my life I think I have had maybe 3 or 4 serious shocks from our 240V mains. I consider even 1 to be 1 too many.
If we promote removing the ground on a guitar amp, that gets thrown in and out of the truck, at some point, somebody gets a shock. Probably a fleeting glance that hurts, and they say ow! and get the thing fixed.
Statistically you are correct, but giving sound advice on safety is never pointless. Have I ever done it because the showtime was fast approaching and the guitar amp was humming away? Yes, I have - but doing it was irresponsible, and when you are standing up in court, knowing the death was a one in a trillion chance, it doesn't actually help, does it.
We are faced with a choice. Promote it as a cure, or promote it as bad practice. I choose to promote it as often as I can as a bad move. Having no opinion is not an option. Statistically the number of people killed on railway crossings is tiny - yet we spend money warning people not to do it, and this too makes good sense.