You will need to have proof of their steam ids for anything to happen, in future take a screenshot when they leave the server or type status into console. As for the individual cases:
1.The video only shows TehWither kill you and does not show if he had a reason. As he could have had DNA on you i suggest that next time you screenshot the logs as evidence that this was RDM.
2.Most likely RDM as he killed a T buddy but there is a small chance (i doubt it) that you may have shot him that round, again it would be nice if you had the logs or knew the round number.
3.No one was confirmed dead so i'm pretty sure he just RDMed.
4.If its the lamb sauce i'm thinking of then yeah its RDM. The first video shows him killing you as they didn't trust you but the second once again he may have had a valid reason but we only know he killed you.
5.He may have had a reason to throw it as he may have had valid proof that you were a traitor. For example having DNA and seeing a you on the tower and wanted a creative kill.
6.Clear RDM as the round had just started and racism should be punished.
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