Not true, as I have just posted to you. And lying to people and sending troops after dissembling same, is not "aggressive" in your book, I'm sure.
The threat from such an unstable regime was very real and something Lincoln had to keep in mind.
Oh, so the way to deal eirenically with an "unstable" regime (that didn't exist, in Lincoln's theory) is to poke it with a stick. Good peace policy. Not.
Lincoln was going for a war all the way.
When all Lincoln was trying to do was hold on to that which belonged to the U.S., then saying that that is an act of aggression is a lame attempt to put the blame for your dumb mistakes everywhere except where it belongs.