If your Indian friend told you he intends to use a time machine to reverse the Partition of India and liberate Tibet, should you report him?

Only children ask these kinds of questions. 

Hey, what's the time in Beijing right now? You sound like a Chinese agent spreading hatred against India. China occupied Tibet, Uyghuristan, Yunnan, Inner Mongolia, Hong Kong and Manchuria with force.

Nah.  It won't affect the Cherokee nation.

Yes, I would call the Doctor in his T.A.R.D.I.S. or the Time Bureau immediately, especially if I saw he had a vortex manipulator.