The Lifeboat

[i3670]

If all 100 people in the water are criminals it's highly plausible that the 50 people in boat is also criminals.

It also depends on what you define as a criminal. A criminal can either be a psychopathic killer, a file sharer, tax evader whatever. And how would you know if they were criminals? Would you question them 1 by 1 as they try to come aboard and ask them "Are you a criminal?" To which they would always answer "No." because they can either lie/tell the truth or drown.