I think I would agree with you on this. However, right to freedom of religion is guaranteed by our constitution and missionaries do a lot of good work too during national disasters. Besides, the caste system in hinduism prevents orthodox though rich upper caste hindus from helping the untouchables ... the poor/distressed lower catse guys find relief with help from missionary and so we can't blame them for embracing christianity.
you can't kick a guy, call him the lowest hindu, a social outcast, a burden on society and then curse him for accepting another religion.
RSS and Shiv Sena are doing talibanization of hinduism, which is wrong.