I'm sure that once the technology matures there'll be plenty of fake meat base cultures that are perfectly vegan. Besides, even if the resulting meat isn't completely and utterly vegetarian / vegan, shouldn't a vegetarian support non-vegetarians eating such meat, even if they wouldn't themselves?
Also, after a certain point it becomes pretty holier-than-thou to say "Ah, but a dead animal was involved at some point, therefore it's not perfectly pure". If you start off with dead calf foetus stem cells, but then keep that culture going for many kilos or even tons of fake meat while you toss in plant-derived amino acids, isn't that pretty much vegetarian? (Especially if the stem cells are a byproduct of a dead calf that would have been killed anyway.)
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Also, after a certain point it becomes pretty holier-than-thou to say "Ah, but a dead animal was involved at some point, therefore it's not perfectly pure". If you start off with dead calf foetus stem cells, but then keep that culture going for many kilos or even tons of fake meat while you toss in plant-derived amino acids, isn't that pretty much vegetarian? (Especially if the stem cells are a byproduct of a dead calf that would have been killed anyway.)