Mutations are random. You can't make a gene mutate in the wild.

When a gene mutation does occur, it is still largely unrelated random factors that will determine if the individual with that mutation survives to pass on the gene. Only once that mutation has spread to a large enough portion of the population, will statistical tends become significant.

If an established gene is not harmful enough to survival and mating, then diffusion will sustain it in the population. Random mating means that any sufficiently established gene will reach an equilibrium between selective pressure reducing its prevalence and diffusion bringing all alleles into equality.

As long as it's not so much worse that the individual dies before mating, the gene will spread through a population. Over a long enough period, if it is less productive at surviving, it may eventually die out, but that takes many generations.

Who says an assassin has to be sneaky? As long as they kill their target, job well done. Just send Gregnok on jobs where it's not an issue.

It was almost certainly Banksy's intention to point out the freezer. If nothing happens, then there's art. If it gets thrown out, then it's a different kind of art. That's really on brand for him. Of anything, this is more of a Banksy now than when he originally painted it.

From your picture, it looks like the glass should be enough to block almost all of the radiation anyway.

Relevant XKCD

Unfortunately, they only learn from each other when it comes to restricting rights. Actually making life better for the common man is every state for itself.