Are un entitled to rage?

I am not talking about what is punishable, what i am asking is, if this kind of behaviour should change Riot view, regarding punishing players.

I have had a couple of games, where i felt like, i was entitled to rage.

First game. I had a darius top vs pantheon. and because my top was being destroyed he asked for ganks. He tells me that pantheonn has no flash, and when i gank, i take that piece of information into consideration. Well, bcs i did not know that my own toplaner lied to me, i died :). I did not expect him to flash. Ofc, i called him an idiot,:)..i honestly felt like i was entitled to do this

Another game. I had a kassadin mid, who gets ganked early but he survives. He tells me that the enemy jungler has no flash. And i was in position to make a play, a late countergank. I flash for him, and the jungler also flashes, which baits me to my own death. Again, i tell this guy, he is an idiot.

this players were not trolling, they were just tilted or stupid (the kassadin mid, argued with me all game long, saying that i was wrong - and i wasn;t. i even asked the enemy jungler if he flashed, later on , and he confirmed. But what made me mad, was the fact that the kassadin, told me how i should have acted:).  Now, when u make a mistake like this, you are in no position to give advice:)

the point i am trying to make is simple, there are several situations,  where you are entitled to rage. I am not talking here about talking all game long, wishing people death or some other kids stuff. In the heat of the moment, when someone makes a huge mistake , and gets flamed  for them, honestly, it's only natural for people to react like this:). 

what is riot stance on this?? My personal opinion is that people don't report players who flamed them, if they actually made a big mistake:).