That's my take. Most people today overlook the fact that the Dred Scott decision had the blurb that blacks could never ever be American citizens. Most people today just look at the argument of if a slave becomes free if he and his master travel to an abolition state for a while then travel back to a slave state.
But to the abolitionists in the 1850's the Dred Scott decision was as much of a national blow against abolition as the Roe v Wade decision was a national blow against pro-lifers. Remember how the pro-lifers went from trying to win the argument at the state level to having to win it at the federal level (now with it being back at the states due to the Dobbs decision)? That's pretty much how the abolitionists saw the Dred Scott decision, except they didn't wait 50 years for a new SCOTUS decision to overturn it.
Dicta, not holding. Judge Taney's opinion, nothing else.
It’s been going on 200 years that we’ve De Facto been handing citizen out like candy to every Tom, Dick and Harry.
Can we please get over our national Dred Scott shame?