Matthew Prince received a massive backlash for this decision and he hasn't once been able to elaborate on what evidence they had. As mentioned, I believe it was merely a convenient excuse to justify backtracking on his definitive promise less than 48 hours later.
If he had evidence of something that constituted a threat to life, why didn't they share it with the operator of the Kiwi Farms so that it could be removed? If it was as damning and credible as he claimed, why did none of the authorities follow-up on it?