Yes, I'd have signed up with the Union to help wipe out the traitorous slaveholders and help free the slaves. (Normal)
Yeah, right.
It's easy to say on the internet that you would do think knowing that it won't actually happen. The American Civil War was a brutal, horrible war involving horrendous injuries and maiming. I would've gone if drafted (Union) but I'm not gonna sit here and pretend I'm some kind of hard-ass.
Let's not forget that the conventional wisdom in June 1861 was that the war would be over in a mater of months. Most of those who enlisted prior to Bull Run/ Manassas did so thinking it would be a wonderful adventure and didn't really understand what they were getting into. The average Atlas poster being a young male, it seems highly likely that most of those who've said they would have rushed to enlist probably would have.