Generally from this:
Because the statement is based on something we'll "never" know. If we mandate safety on the basis of something that "might" happen, the logical conclusion to that argument is that we shouldn't do anything risky.
But something "might" happen in any activity, in fact
@Oldhippy 's suggestion we get experience from YouTube is a bit, well, risky; think of the danger of electricity, of cables as a trip hazard, sharp edges of tables, and the possibility of the flat screen monitor falling on you.
That may not be what you had in mind when you suggested it, but the logical conclusion of the argument is that we try to stop all risk, which means we stop people doing risky activities.