Most of the blowing up on the launch pad was in the mid and late 50s. By the time of Mercury, Gemini, and Apollo, we were mostly beyond those early problems. If they were still blowing up with the regularity of the 50s, we would not have had manned space flight.
“Most” is not very reassuring, if it’s your ass on the pad.
At least one explosion was witnessed in person by the Astronauts. There was an umcomfortable silence. And then somebody said “I’m glad we got that out of the way.” LOL!