Oh, apologies, I'm not saying that King didn't risk considerable injury or death. I'm saying that I don't think he is talking about that in this particular passage. The passage gp quoted is about how accepting lawful penalties from an unjust law venerates and respects the rule of law.

I think it's different with illegal "penalties" like being mauled by a dog or an extrajudicial killing. While those leaders of the civil rights movement faced those risks, I don't think King is asking people to martyr themselves in that passage, but to respect the law.

In contrast to accepting punishments from unjust laws, I think there is no lawless unjust punishment you should accept.