my mother, whom I looked up to v much, said cracked plates must be smashed as the cracks keep dirt which harbours germs. she worked in hospitals during the war. nothing was carelessly wasted then. so I would use the same principle re cracked crockery. the glaze is broken, so can they really be effectively cleaned, even in a machine I don't know. anyway I am a one item person, so its not a problem. I always point out in a café if I see a cup/glass with a crack/chipped and tell them it must be thrown away.
if I get a piece of cutlery that is not clean enough, I loudly throw it on the floor in café, and say I dropped it and ask for another. perhaps I should do that with cups, but it a bit tricky if they contain liquid.
my mother was a strong person. would have been good as a warrant officer in the army. clear, authoritative, intelligent, self-assured. wish I'd been more like that. or something