That's the problem alright. You are formulating an opinion without having the facts. I can tell you what the evidence shows: the killer threw Meredith to the floor, so she was face down on her hands and knees in front of her wardrobe, with him behind and on top of her, wielding a knife in his right hand and holding his left hand over her face to control her and to keep her from screaming. He stabbed her in the right side of her throat, and then inflicted a large, slashing wound by stabbing her in the left side of her throat and pulling the blade toward him, i.e., up and to the right. He also cut the backstrap on her bra. When she ceased to struggle, he rolled her on her back. Her shirt and her bra were pushed up above her breasts when she gasped her dying breaths, which explains the fine spattering of round blood drops on her breasts and torso.
Then he moved her a few feet to the position where she was found. He put a pillow under her buttocks. He cut her bra away and left it at her feet. He removed her pants and underwear and assaulted her sexually. When he was finished with that, he went into the bathroom and cleaned himself up, using the bidet as a fountain and removing his right shoe at some point, which is when he left his bare footprint on the mat.
After he had cleaned himself up, he went back into her room, pulled the quilt off the bed, and spread it over her. He sat on the edge of the bed with the bloody knife and went through her purse. Then he walked out of the room, locked the door behind him, and left a trail of shoe prints starting in her room and running down the corridor toward the exit, with each successive step becoming fainter.
That is what really happened to Meredith Kercher. The rest is a fairy tale.