Molecular jackhammers' 'good vibrations' eradicate cancer cells

I think that the reasoning is that no cells will have even partial resistance to mechanical action, therefore "fitness" wouldn't develop in surviving cells. i.e. there's no fitness function with improve upon. Perhaps the ability of these dye molecules to infiltrate could be affected, but given the fundamental structure of cells, that may not be a likely outcome within a single human organism (since cancer is generally non-communicative)

Also the fact that they're activated/powered by an external light source, meaning it's fine if they accidentally bind to healthy cells as long as those cells are not within the area getting beamed.