The 9th and 10th do not, IMNHO, make way for unilateral secession.
Believe it or not, I actually wish that secession had gone peacefully. That's the key word: PEACEFULLY. Among other things, it needed to involve all parties (the Federal government, the seceding states, and those states that would suddenly find themselves as bordering on a nation that could, under some circumstances, be a hostile one). The South also needed to not engage in stealing Federal property and just BUY the damn forts.
Somehow you've this mass delusion that allows you to see an overriding commerce clause.
And somehow, you think that unilateral secession is just an absolute given, based on vague language in the 9th and 10th amendments. By that argument, a person may then secede from the United States, declare his land to be a sovereign government, and shoot at his neighbors as he sees fit.
Your last comment to my post also reveals quite painfully your rejection of the 4th and 5th Amendments. (Innocent until proven guilty is the specific part of the 5th Amendment you're ignoring.)
Hmm. You still haven't explained how my comment is wrong. Sergeant Stryker had a very sage line of advice in The Sands of Iwo Jima.