That's 3 reasons why that is even an option. This affects everyone's game experience. Yes, you may be innocent, but it's kinda not possible to remove this ability because 75% of the community uses that ability wisely.
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Here is an example of a ranked game i played and got both demoted to Silver 5 and reported by the wrong-doer:
AP jg game,
support, and i don't remember the other champions
Our ults rivaled each others, and i accept at times that a cancellation of my snare will happen, but we were under a full tower with all of our members above 75% health, and the enemies all 5 dove to the center of the tower, each below 50% health. We had cc to keep them in tower range, so I ulted. Before the tower could go off and shoot,
ulted. Everyone made it out alive. My other team members just said "bad luck am" and "#latereactions" or something like that, but the support blamed me for not snaring them, because that makes sense
[zombie-brand-mindblown]
Anyway, the rest of the game, she was way to salty in chat. If i ulted, she ulted. She told us after the match that was her only goal in the game anymore. She started talking in /all chat saying we were all roasting her for sucking, that it was "typical support abuse"
None of us had said anything. My teammates all had my back in /all chat, and I considered befriending each of them for that. Obviously, we lost, but we would have easily won if she had tried.
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The point is, there will always be players that will do that. There are mean people, and that is all they do in the League community. I wish there was something we could do other than reporting them, but they probably all have 12 smurfs to continuously do this.