another take... you can choose your friends but you can't choose your family. Great topic to debate.

The frog could get across the river with the scorpion on his back...scorpion could not swim. Scorpion said trust me and the frog did. once at the bank the scorpion stung the frog. The frog asked why???? he said I am a scorpion, that's what I do.

In reality, depends on the situation. Had this same question in an ethics class. Just like the frog and the scorpion.