This um, really flattens the terror waged on the Gauls, the Germanic tribes and, later, the Britons, amongst others. His victory at Alesia led to the mass enslavement of captured Gauls. Vercingetorix was captured and later executed in Rome. I'd say invading someone else's country or threatening to is VERY akin to Gaius Julius Ceasar.
Yes, he was very popular with the people of Rome - but he was also famously incredibly corrupt and bribed officials to maintain his power after the conclusion of the civil war (which he started by returning from Gaul with an army and marching on Rome). Julius Ceasar is hated because he ended the Roman Republic and created the Roman Empire - that is how he became a tyrant. By removing what little democratic process there was to install himself as the ruler of Rome. His successor Octavian even deified Ceasar and turned him into a God.
Ceasar's death is celebrated today, in 2025, because there are many tyrants in the world today (not just America) who have plans and machinations not unlike our old boy Ceasar's. Like Ceasar, they are populists, are dismantling the democratic process and seek to expand their nations influence through conquest and economic subjugation.
That is why we are celebrating today.