By your count - which I don't dispute - it was not just wealthy industrialists that wanted to violently attack the South in cross-border murder raids.
Your point is well-taken: a cross section of the North was willing to fund and support murder raids. Then, as now, many people defended what was done and contend there was nothing unconstitutional or wrong with the John Brown attack.
How many “murder raids” did the North fund.?
It was not the South that they wanted to attack. It was the institution of slavery. No slaves, no John Brown raid on Harpers Ferry.