You guys contradict yourselves. Yes Hindu Kings conquered India, no they didnt spread Hinduism ‘by sword’.
You give Malaysia/Singapore as example, do you think the acceptance of Hindu kings there was NOT through the usual means of conquest? Where there is sizable Hindu presence today, for example Bali, there was also a Hindu empire previously. An empire formed through conquest. Here is how the first Malay kingdom was formed:
This was defeated by this Hindu empire, and the struggles involved are hardly non-violent.
What is true though is with the advent of more powerful powers like Islam and Christianity, the impact of Hinduism outside India was summarily curtailed. Subsequently, they could not advance beyond the limits they were circumscribed to, and later revisionists try to paint that as a progressive choice that they made.
They were simply unable to, in the face of superior powers.