The federal government was steadily usurping ever more powers the states never agreed to delegate to it. Everybody could see which way the wind was blowing.
Lincoln was a tyrant. He censored the press and all telegraph traffic, he imprisoned between 13 and 38 thousand people without charge or trial, he ordered the chief justice of the supreme court to be arrested for ruling in ex parte Merryman that he could not simply suspend habeas corpus by diktat and throw a man into a federal gulag, the list of his abuses of constitutional liberties is a very long one.
There was no significant growth of federal power prior to the war.
If you want to speak of a tyrannical government look no further than Richmond. It even had a draft prior to the Union.
How does a “tyrant” allow an election which even he thought he might well lose?
That wasn’t a wind, it was a fart.
He was Commander-in-Chief which, in times of war, can stray temporarily from the Constitution.
What can be more absurd than claiming HE violated the constitution when a rebellion was trashing the whole thing?