first off, most cars do not look for bikes when they turn.

secondly, they certainly do not look for bikes on the sidewalk when they turn.

but your story seems to be saying that it didn't matter, that they should have been able to read your mind and KNOW that they could make the turn before you got there. but if they just spotted you, right when they were in the intersection, a) they would have had no idea of your speed and thus whether they should continue or not and b) they would not have had time to "make a proper decision" (ie. either stop before they're in the intersection or continue to make the turn).

so, instead, they stopped and let you go (which is what they should have done, what with "right of way"). they assumed YOU were in control and could avoid them without hurting yourself. you were not. don't peg it on them; sounds to me like they did the best they could, given the circumstances. certainly more courtesy than I expect from a motorist, and more courtesy than you showed them when you hit their fender and then just kept going.

get a brake or learn to stop properly without one. and ride in the street.