So after a while of playing league......
You soon realise how important what ever you say in chat is and how it can help(unless your that douche who says noob,drink bleach,kill yourself,downs syndrome,autistic mother fucker, etc....) when some1 is behind just help'em out give them some tips suggest an item AND DO NOT BY ANY MEANS(i still flame from time to time still trying to stop that)discourage them by saying they suck which may just end in an argument for the entire game when 2 people are arguing try to indirectly solve the issue this is although difficult can help them out and have a smoother game(as in support both sides of the argument till they reach an agreement)
i realised this in 1 of my recent games where somebody said he was depressed and wanted to commit suicide I at the time was suffering from the same thing so i talk to him some nice banter how we both get rid of depression by playing league.game him/her some tips since he/she was losing lane ended up with a better score a good impact on team fights then he/she asked a question "if you were in my situation would you kill yourself?" i gladly said "no"
remember this A word can be a sharp knife pointed at there head or a soothing thought into there heart choose wisely for what you say matters