So what you are saying is that if any small country kills our people, we should let it go. Remember they are not killing for the first time, this has been going for a long time. Its just highlighted all of a sudden (i presume because of DMK).
No one has the right to kill any human and if they kill an Indian, then India needs to show a fitting reply. If that is to go and fight with "little tiny Sri Lanka", so be it.