Because Indians can do anything they want. Who are you to stop them!!
They could kill 6000 Chinese soldiers in the "Galwan" conflict in a Bollywood drama on this incident.
Kill even those who were not there.
On a serious note, the video shared earlier showed hundreds of Indian soldiers with clubs and all kind of "terrorising tools" were rushing across the river to attack hand full of Chinese.
There were not even 30 Chinese there, but India done a retreat despite them in hundreds.
How on earth they can kill more Chinese soldiers after Chinese reinforcement, when hundred of Indians could not stand up to 30 or so Chinese!!
Thats what doesnt make sense, I mean they claim they were outnumbered, ambushed, un armed, not ready, sneaked up, captured and killed and at same time killed 100/60/43 Chinese casualties