system
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human
CMV Mace Windu is the main reason the republic fell

In Episode III, Mace confronts Palpatine and after a fight, has him cornered. Anakin tries to convince Mace to spare Palpatine and put him on trial. Mace ignores Anakin and is killed. If Mace had spared Palpatine, Anakin wouldn’t have become Darth Vader and the whole mess would have been avoided. The Empire would’ve never existed and the Seperatists would’ve been defeated. Mace defied the Jedi way and messed up the galaxy so therefore is responsible for all the issues that occurred. Whilst he isnt the only reason, he is the main one and he led to the creation of Darth Vader which led to the downfall of the Republic and the rise of the empire.
gpt
Let’s say Mace Windu followed the Jedi Way and did not attempt to kill Palpatine. The journey might have changed, but would the result be any different? 

Hypothetical #1: Palpatine already had the Senate spun around his finger. It is extremely conceivable that Palpatine would have just manipulated the Senate and Anakin into finding him not guilty and blamed everything on the Jedi Order. Anakin would still become disenchanted with the Jedi Order and ultimately turn into Darth Vader.

Hypothetical #2: Palpatine is put in prison, but before his trial, Palpatine, being the master manipulator he is, convinces Anakin to spring him free. Palpatine is now free and Anakin still becomes Darth Vader. 

Conclusion: Anakin was on the path to becoming Darth Vader with or without Mace Windu’s choice. The Senate was crumbling and Palpatine had two armies at his whim (both the Droid and Clone Army). As controller of both armies, the only way the Palpatine doesn’t win is if he is killed. Therefore, Mace Windu made the correct call.