Sikh terrorism was in existence before 1984. So, to claim sikh terrorism started after 1984 is factually incorrect but if you feel happy that you have justified, you may feel so. But thats not the TRUTH !!
Sikh Terrorism was instigated by Pakistan (ISI) to cut-off Punjab from India & thereby claiming Kashmir. But the plan didn't work sadly.
Militancy & Terrorism will never achieve the goals for which strive for. At the best they can hurt but will never change the policies of any country nor people' way of living.