I think they clearly meant that, when all drivers are divided between those who have even once texted while driving, and those who have never texted while driving at all, the former group is 21 times more likely to get into a wreck than the latter.
Because texting while driving is clearly the mark of a lunatic with callous disregard for their own safety and that of others, and you can't expect that kind of person to drive safely at all, let alone be one of the Elect.
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Or another interpretation:
Because texting while driving is clearly the mark of a lunatic with callous disregard for their own safety and that of others, and you can't expect that kind of person to drive safely at all, let alone be one of the Elect.