People forget that Caesar was assassinated not because he was some tyrant, but because he tried to give the common people's councils more power and was becoming insanely popular amongst said people. He was a decent statesman, a decent general, and a surprisingly decent philosopher and learned man (literally invented the modern calendar), effectively one of the few people that fit Plato's philosopher-king standard since Alexander. The senators, effectively ran by an oligarchy of gossipy catty teenage girls petty kings, didn't like that, especially since before he was a relative nobody amongst the aristocracy, with little gold or political power to throw about before his success as a general. So then they crown him because he won a civil war they started, then killed him, then also immediately knew they fucked up after killing him and had to prevent another civil war by basically invoking divine right to rule and crowning Octavius...who then took the name Caesar.
tl;dr senators are retarded no matter what era.