Lincoln was not at all in reactionary mode. Not from the time he was elected until after he lost the first battle.
Also, you cannot call it an insurrection while also doing several other things Lincoln did, which would have then been unconstitutional. Re: ridiculous assertion of 'war powers'....war against citizens? Ok. It's one way or the other, and if it's putting down an insurrection then he committed many crimes.
But, I'll play, If California seceded, the President sent federal troops in to secure 'federal property', and California took such site by force, with both sides exchanging fire and no lives lost, would the President be justified in invading California, suspending habeas corpus, etc. etc. etc.?
Who started the American Revolution?
Washingtons image remains untarnished since the whisky rebellion was averted, but what an absurd invasion of Pennsylvania.
It's all about power and money. Secession for the southern elite, invasion of the south for the northern elite. However, there is no war without northern invasion, and coercing the southern states back into the union was and is absurd.