Parents choose based on what they think is the safest option for their kids. To put the blame entirely on them will not be fair. One of the most interesting things I find about the American way of life is, people start taking up jobs from a very young age. IMO this helps them explore options and also discover their own interests and even aptitude for a particular line of work.
Also in the Indian way of life hobbies always come second to academics.
Nowadays, more and more Indian parents seem to be receptive of "unconventional" career choices. Not saying that it's common, or that most don't push their kids towards engineering/medicine, but the situation seems to have improved over the last decade or two. However, you still hear tragic tales of kids who were forced into a field in which they hold no interest.
