Yes, Periyar participated in Vaikom movement for dalits entry. Agreed. But 'most of periyar activities for dalits' is a big question mark.
Then why could Periyar not change the mindset of powerful OBCs in TN to patronise dalits? Vaikom was a old one but the kandadevi episode is happening every 2 years between thevars and dalits. What did MK do to solve it? No party is touching the issue because of vote bank. As a Dravidian leader, MK should have punished the guys who are involved in kandadevi. He was just sitting and watching the fun.