Conversation so far:
What political issues did Rajinikanth get involved with?
In 2002, Rajinikanth protested the Government of Karnataka's decision to not release Kaveri River water into Tamil Nadu.
Did Rajinikanth do anything else in support of his protest towards the Government of Karnataka?
Rajinikanth announced that he would contribute ₹10 million toward a plan to interlink Indian rivers.
Did Rajinikanth protest or anything toward the Government of Karnataka's decision to not release Kaveri River water into Tamil Nadu?
Rajinikanth undertook a day-long fast to protest.
Did Rajinikanth's day-long fast protest work?
Did Rajinikanth get involved with other political issues besides the Government of Karnataka's decision to not release Kaveri River water into Tamil Nadu?
In 2008, Rajinikanth took part in a hunger strike organised by the Nadigar Sangam against Karnataka's stance on the Hogenakkal Falls water dispute.
What was Rajinikanth position on the issue against Karnataka's stance on the Hogenakkal Falls water dispute?
Rajinikanth warned leaders not to inflame the water project issue for political gains and requested that the issue should be resolved soon.

Question: How did he warn them?
Self-contained rewrite: How did Rajinikanth warn leaders not to inflame the water project issue?