By definition, if you're a vegan or vegetarian for strictly ideological reasons, you still like the taste and feel of meat. So, compared to a vegetarian or vegan who is doing it for other reasons, you're statistically far more likely to seek meat substitutes.

Now, this relies on considering people "ideological vegans/vegetarians" if their only motivation for not eating meat is ideology. This means that the huge amount of Hindu Indians who are ideologically opposed to eating meat don't count, since even without this ideological motivation, they would still have traditional and social and supply reasons to not eat meat.