Even if this hypothesis is correct, I would replace "dangerous" with "unpredictable", because the resulting effects of those interactions would be as likely to cause good as to cause harm.
Just look at Atomic gardening [https://en.wikipedia.org/wiki/Atomic_gardening] - a practice which should be /way/ worse if mutations really did produce bad effects most of the time. Instead the effects were either dud seeds or a few useful byproducts as opposed to 'this grapefruit is now rich in cyanide'.
They're often partners in crime, when it comes to subjects not well understood. Especially with something as fragile as DNA.