The primary cause for the current China India tensions are due to India taking an anti-China posture. However, regarding the incident last week that caused 20 deaths on the Indian side, I doubt that was part of state policy, but rather passions overflowing between the local combatants and the Chinese side taking the conflict a step further by arming themselves with more weapons awaiting an Indian team that crossed the LAC thinking it would just be another shoving match. Quite unfortunate and short sighted, but I can't imagine that creating more tensions with India would be in China's interest.