The south was not sufficiently aggrieved by Yankee corruption to secede from the union. Yankees did not have a monopoly on influence peddling.
Lincoln did not appear on the ballot and did not receive one vote in the south during the 1860 election and yet won an electoral victory. The south realized that it would be a permanent political minority and would be dictated to by the central government on the question of slavery. The south seceded to form its own government to control its own culture, economy and destiny. The question of slavery was not a primary reason for secession but rather a symptom. The south did not want to be told how to live by Yankees.
Astute summary.
And the North was telling the South what to do about what?
Slavery.