Amusement parks are slightly more systematic about trying their best to not kill people than "let's see what happens if people interact with this known-deadly machine when we remove the part that makes it less deadly (i.e. the grounding)".
It's just a difference is scale of risk. For something closer: base jumping is still popular, no-harness climbing of tall buildings is still a thing on YouTube, crazy Russian groups still do pull-ups on construction cranes.
It's just a difference is scale of risk. For something closer: base jumping is still popular, no-harness climbing of tall buildings is still a thing on YouTube, crazy Russian groups still do pull-ups on construction cranes.