Why did David trust the baker?

David decided he trusted the baker because of the expression on his face, and his good natured eyes, which were similar to the sailor's who'd helped him previously.

He looked up into the man's face and saw it was just like the sailor's - the same slightly stupid expression, the same good-natured eyes. David hesitated; perhaps he would not have him arrested. There were some good people - Johannes had told him so - and he had heard the same thing from other prisoners: they had often spoken of those who had helped them and hidden them for long periods when they were after them.