Overall, Sikhs have relatively low crime rates, low rates of reliance on public assistance, high educational attainment, high income, high net worth, and high business formation rates; as compared with other immigrant groups.
The incident that you mention was a very specific and exceptional circumstance - not the kind of wide-ranging jihad like we see in islam.
It was directed against the Indian Government (an Air India flight), in retaliation for the Indian Government’s 1984 Operation Blue Star - where the Indian Army invaded the holiest site of the Sikh religion (the Golden Temple in Amritsar) and killed thousands.
Those turbulent times are over. The pro-communist Indira Ghandi who ordered the massacre is dead (gunned down by her Sikh bodyguards), and the sectarian tensions between Hindus and Sikhs has basically healed. India even had a Sikh (Manmohan Singh) as its Prime Minister from 2004 to 2014.
They are heavily involved in Canadian west-coast drug trade. Along with the other Asians who you say don't commit crimes.
I like how you describe an act of cold blooded mindless terrorism planned executed by Sikhs in CANADA, not India. You make it sound like it was justified.