If a murder is committed privately it is considered a crime. But if it happens with the authority of the state, they call it courage.
Marriage of attraction is a gamble anyway, so you might as well marry into a family that is similar to your own, and make that much less of an adjustment. But the 'love marriage', as it is called, is equally common in India now. But it would be interesting to do a comparison of what would work better. Marriage is hard work, and it is a gamble.