I know there seems to be no apparent motive, but that shouldn't be an excuse to turn a blind eye to the evidence we do have. Sometimes people do things that don't make sense. Remember....."everyone is different," "people don't all act the same way," "we never know what is going through someone's mind," "they might not act the way you or I do" -- these are just some of the variations I've been told from people on this forum as to why I should not speculate on Amanda's behavior. So, I'm going to turn that around and bring it to the other side -- we shouldn't try to think of the situation in terms of what we would do. Killers are not reasonable people....the people who killed Meredith - Rudy and whoever else, they are not reasonable people. We can't think of them in terms of what you or I or any reasonable person would do.
For a largely circumstantial case, you need a motive or at least a plausible tie between the defendants. Here you have neither. That has nothing to do with what is reasonable behavior or how I or you would act. It has to do with what we know about crime in general, and I don't think there has ever been a case in which 3 people, 2 of which only met 1 time in a casual encounter, decide to murder someone, where there is no preexising issue like jealously, sex, revenge, etc. between the defendants and the poor victim. If there is a case where 3 strangers decide to murder someone where there is no preexising issue w the victim, I would like to know. Murdering for kicks sometimes happens with a lone male or 2 males and is often pre planned. Most times women are involved in a murder they are alone or they do it as part of a couple. I never heard of a case where a women goes w her boyfriend of 7 days and a stranger to murder someone out of the blue one day.