Assange is evidence.
Before dismissing that, note a couple of things:
- I didn't claim (nor would I) anything about all asylum seekers. Or even any weaker quantification beyond a comparison with the general population.
- Evidence and proof are of course very different things.
So yes, a sample of 1 can be evidence - and is easier to quote here than any more detailed or authoritative report containing stronger evidence. Just apply Bayes' Theorem using the sample we're discussing.