“Therefore he should be convicted of murder?”
I was not on the jury.
But, the evidence in the video shows that he shot Scott in the back and then planted a weapon next to Scott. We also know that Slager lied in his report.
Typically, if you shoot someone in the back and then lie to the police about the events prior to, during and after the event, you will get convicted.
Murder requires malice aforethought. In other words, premeditated intent. There is no evidence of that here.
Manslaughter would be plausible.
By the way the “planted weapon” was Slager’s taser.