Though it's 100% wrong, but the root cause of this is sudden surge of hell lot of Northies to Bangalore.
Past 15 years lo IT boom valla everything went into hands of Northies. So over a period this Kannada tradition, festivals,culture everything good Damaged to major extent.
So pani paata leni few kannada organization ila artham partham leni rules tho attack chestunnaru.
Obviously northies ki BJP support So these kannada groups are backed by congress.