there is no evidence of it ever being done successfully.

There is evidence that cryonics preserves brain structure to some extent, which, coupled with the fact that people are brains, constitutes Bayesian evidence that cryonics suspensions performed up to this point were successful (that is, information-theoretic death didn't happen). What you require as evidence in this case might be a clear-cut demonstration of a cryonics patient getting revived. However, if we already knew how to revive people we wouldn't bother with cryosuspension in the first place. You can't, at this point in time, reasonably expect that kind of evidence, even if cryonics works perfectly.

Freezing things makes water expand and burst the fragile parts of your brain.

Correctly performed cryosuspension involves vitrification instead of freezing.