Is it moral to use somebody else's crisis to prosletyze?

[Dookus]

Two instances make me ask this. First, and largest, is the stories about Christian missionaries using the tsunami as an opportunity to gain converts. Second, is elsewhere on DU, where somebody urged another poster undergoing an acute crisis to "consider getting right with God".

Personally, I find both instances incredibly offensive. Firstly, it presumes the "missionary" actually knows how to get right with God, and also knows that the subject somehow does not meet the criteria. I find it haughty, condescending and arrogant.

Is there ANY crisis where simple human decency and comfort are adequate, or must all crises be seen as an opportunity to gain souls for one's personal lord?