LP should be based on match preformence

so i play like 10 games a day and what ive noticed is that 90% no literally 90% of silver bot lanes on my team specifically int like i dont understand most of the time top and i (mid) can do pretty good hence my 66% win rate on kassadin but recently in the past 4 games i am able to beat my lane opponents but, my bot lane gets samshed fam like insanely smashed and then top and they all 5 man mid and my bot and top come ace they get rift issa a wrap. so my thing is why can lp gained and loss include your mmr and also ur match preformence. casue i seriously cry when i go 34/4 and my thresh and adc decide 50 mins into the game they wanna do a bone headed engage die top and jg try and help im alone we lose and i lose 22 lp insane i actually cried after this game