>
Cicero invented the conspiracy of CatilineThe “extent of the exaggeration is unclear and still debated; most classicists agree that the conspiracy occurred as broadly described – rather than being a Machiavellian invention of Cicero's – but concede that its actual threat to the republic was exaggerated for Cicero's benefit and to heighten later dramatic narratives” [1]. Think: Giuliani invoking 9/11 at every turn of conversation.
> had Roman citizens put to death without trial
The Senate let him by passing the SCU [2]. He was quelling a rebellion and Rome had no jails. Again, not unblemished good guy, but given the circumstances, within the shadow of doubt.
> literally appointed and was a warrior on the side of the oligarchy (the Optimates) all his life
This is a callous reading of his policy views. He advocated for stability. He wasn’t Roman patrician elite, and had experienced what political instability in Rome meant in the countryside. He had loose alignment with Rome’s conservatives, but in a pragmatic way, and was on good terms with Caesar and even Octavian.
[1] https://en.m.wikipedia.org/wiki/Catilinarian_conspiracy
[2] https://en.m.wikipedia.org/wiki/Senatus_consultum_ultimum