The main point relevant to this discussion is the violence perpetrated by EP rebels, specifically atrocities against civilian non-Bengalis in pursuit of a political objective, and the International Commission of Jurists (an NGO) does not, as far as I can tell, condone those killings in any manner, though it makes a broader argument that violence by rebels was justified (an argument for another thread).
Since the point about atrocities by rebels is clear, I'll move on to this bit of Indian double speak:
Nor is the Pakistani State sponsoring any crime. The Pakistani State is, however, sponsoring a struggle for freedom from oppression. Any death of innocents is always regrettable, however, this is the right time to recall that Mao
speak:
'A revolution is not a dinner party, or writing an essay, or painting a picture, or doing embroidery; it cannot be so refined, so leisurely and gentle, so temperate, kind, courteous, restrained and magnanimous. A revolution is an insurrection, an act of violence by which one class overthrows another'
YouTube- Broadcast Yourself.
Again, India has no standing to be criticizing Pakistani support for the Kashmiri insurgency, or the atrocities by some insurgents, given its own actions in supporting what it calls 'terrorists' (in J&K) in East Pakistan in 1971.