After you brush up on your "facts", we can continue.
I suggest that it is not I who should brush up on facts. To wit:
It was a recognized concept (take that DoI preamble) that a state could seceed.
The Constitution itself is silent on the subject. Still it makes sense that, once admittted, a state should have the right to leave. The most logical way is that a state should be permitted to leave in the same manner as it was permitted to join - through the consent of the other states as shown by a majority vote in Congress. The southern states chose rebellion instead.
...he suspended Habeus Corpus for the duration of his presidency...
Utter nonsense. Habeas corpus was suspended at various times during Lincoln's presidency, both by his order and through legislation passed by Congress. That was a tool used by the administration to combat the rebellion. Nothing in it was unconstitutional.
...just after they were elected, rounded up and imprisoned a double handful of merry-lander state congresscritters because they'd made pro-middle-states-secession noises during their campaigns.
The arrest of some members of the Maryland legislature occured in September 1861. Not after they had been elected but while they were agitating for rebellion. Given that the Maryland legislature had voted against secession in the spring and that fighting with the south was underway then arresting those who advocated rebellion against the government was a prudent act.
I have nothing but contempt for those who took the most perfect guideline for creating a government, one that protects individual volition, responsibility, and property, and basically uses it for toilet tissue.
You must really hate Jefferson Davis then. Or haven't you bothered to read up on him?