Ranked is Toxic because there's no consideration

I recently had a game where, I can only assume, I had a first time LeBlanc. She managed to do 2.9k damage in a 31 minute game. Keep in mind, my Thresh support did over 6k damage. When I noticed LeBlanc had not only died in lane 4 times, but wasn't even using her combo and looked like she didn't understand how her W worked, I asked her, "Have you ever played LeBlanc before?". Immediately this person gets pissed off and starts raging, but in all honesty, how can you not ask that question? I understand people have bad games or lane versus better people, but when somebody doesn't really have a grasp of the champion it makes you wonder why they even chose that champion to begin with? People say it's toxic to question a person on why they decided to play that champion, even if they had 3-4 other champs they're far better on to play, but why? I played top because nobody else wanted to, the 2nd pick decided to support so that 4th pick could mid, but the 3rd pick too mid instead. 5th pick wanted ADC, but had to jungle instead.

The thought process behind toxicity falls (usually) on the person who is getting flamed, because you screwed everybody over in champion select not wanting to play X role. So many times I've seen the last 2 picks having ADC/Support open, but 2nd pick taking ADC from last pick ADC main. If you're down 80 CS on ADC at 20, why didn't you play support when you were 2nd to last pick anyways? Of course that ADC main is going to be pissed off you took a role he could have done more in. If people didn't want to experience toxicity, you sometimes have to suck it up and play support. If you can't play more than 1 role, then practice other roles in normals. I know people will say it's pick order, but if you're playing to win, pick order shouldn't matter. If you want to climb, don't play what you "want", play what you're good at and what the team needs. An example of that would be if nobody called top, but you want to mid at first pick, understand that 4 people cannot play top very well. If it's your 2nd best position, you should play top because automatically forcing somebody into a lane they were doomed with to start is going to tilt them. I duo with an ADC main, and when we're last 2 picks, I know I am going support because his ADC is much better than mine.

TL;DR: If you're willing to screw the team over in champ select, you should be able to handle people being toxic towards you.

I know this won't be popular, but this is the truth why people get frustrated and become toxic in ranked. I see it time and time again and don't understand why people play sheep when their decision tilted somebody. I hope the new ranked system helps with this, because I feel like this is the biggest factor in a lot of games outcomes and attitudes. I'm ready for the Bronze downvotes.