Months after Prime Minister Justin Trudeau of Canada accused India’s government of plotting a murder on Canadian soil — plunging diplomatic relations between the two countries to their lowest level ever — the first arrests in the killing, which came on Friday, did little to demystify the basis of his claim.
The police didn’t offer clues or present any evidence that India had orchestrated the killing of Hardeep Singh Nijjar, a Sikh nationalist leader who was gunned down at the temple he led in Surrey, British Columbia, in June. What…