Besides being acidic, it also causes excesses oxidation (as opposed to oxygenation). An acidic environment is conducive for cancer formation and proliferation and oxidation can put cells under stress that results in mutation into cancer cells. While it is true that MMS might kill off some cancer cells, it could imo also cause cancer cells and is at any rate not kind to healthy cells.
Note: I post this because you cross-posted it into cancer forums. Your post should probably have been made in the MMS debate forum instead of here in the support forum.