The Investigation Team came to the conclusion that OJ Simpson killed both his ex-wife, Nicole Brown-Simpson, and her friend Ron Goldman; this being based on various forms of evidence.
First of all, a glove was found at the crime scene, which matched a corresponding glove found on OJ Simpsons property. The glove later turned out to have been bought for OJ by Nicole as a gift, and Simpson was seen photographed in the gloves on numerous occasions. There were also traces of blood on the Glove found at OJ's house. This led the police running the investigation to suspect OJ Simpson very early, not only due to the Glove, but the knowledge that Nicole had previously called the police on OJ due to domestic violence, showing that he was a violent man.
Furthermore, when asked to turn himself in to the police, Simpson proceeded to driver across Los Angeles, in the direction of Mexico, lead the police on a televised police chase. This lead the Police to suspect OJ even more, as innocent men are not seen to run from the police; however OJ blamed this on his decreasing mental state due to the overwhelming fear of persecution, and the loss of his ex-wife.
Finally, upon being examined, the Ford Bronco, owned by OJ Simpson, in which he made his escape contained traces of blood, both from OJ Simpson and from Nicole Brown Simpson... Once again leading the police to the conclusion that OJ Simpson had killed his wife, as how else would her blood be inside his car. Alongside this evidence, traces of OJ Simpsons blood was found at the Bundy crime scene, indicating that OJ had bled at the scene, which was supported by the fact that OJ had a deep cut on his finger, which he 'couldn't remember obtaining.'
As to whether the decisions made by the Investigation Team were justified is a difficult question to answer. As legally, no they were not- as OJ Simpson was acquitted of all crimes by a jury in October 1995, after being imprisoned for 474 days.
OJ was acquitted due to the huge number of blunders committed by the Investigation team, considering both the collection of evidence, and the skill of the Defense Team.
The blood evidence collected from the Bundy property, which if used correctly could have proven OJ was present and bleeding at the Bundy seen; however the examiner admitted to have split a sample of OJ's blood within the laboratory, therefore bringing the results of any experiments into disrepute.
Also, it was discovered that Mark Furhman, the lead investigator on the OJ Simpson Case was a racist, who had been recorded stating that he hated African Americans, and that he wished serious harm upon them, which given that OJ is black was detrimental to the investigations integrity, as it placed the judgment of the police officers involved into disrepute, placing doubt into the juries minds as to whether the evidence had been planted.
After OJ was acquitted, he was then once again tried for damages, in civil court - when sued by the families of Nicole and Ron. The civil court found OJ guilty by means of a unanimous jury, and ordered him to pay over $60,000,000 to the families of Nicole and Ron, therefore proving OJ's guilt in civil court.
This therefore stands in favor of the argument that the members of the investigation team were justified to suspect OJ Simpson; however they went about the trial in the wrong way.
Conclusions
In conclusion, despite the vast amounts of evidence which indicating that OJ was guilty including the Glove, and Blood sample, and the past 911 calls from Nicole - OJ was acquitted of all crimes in criminal court, only to be triad again in civil court and found guilty, indicating that the first jury made a mistake.