Ranked - Feeders, Leavers

So I just played a game, and I had this top laner, who was losing lane - 0/2, but he was csing well, he was really tilted and negative saying how we were gonna lose and blaming everything on the team, saying how nobody wanted to help him. Note that this was still during the laning phase too, we were around level 7 or 8? So basically he expected me, who was bot lane, and everyone else to go up top just to help him. But nobody did that so he became toxic and started cursing everyone out. Even through this I tried to encourage him nicely to play telling him it's ok just do your best. But this guy is something else, he still continued to flame us despite our best efforts to try to encourage him and telling him that he was doing well. Eventually, he decided to leave and come back occasionally to feed. I think it's really unfair that the rest of my team, including me lost points and wasted time and on top of that got put even further behind in our climb because someone decided to be toxic. I mean yes, we all reported him, I hope. But at the same time, that doesn't matter to me as much as losing my points, because it's a waste of 45 mins. I have to play another game just to get back to where I started. So thats 90 minutes out the window. Isn't there a possibility that people who are with these people get a loss prevented rather than a LP deduction? I mean it's really not fair even if he does get punished for it.