“They” never did. The laity did and, as with the Inquisitions, such measures were condemned by the Church.
They do not sell indulgences
This was never an official act. There was a priest charged with raising funds for the expansion of a church building, who went forth and began to solicit people, telling them that their contribution would merit an indulgence. However, he did not present it quite that way, instead “overselling” it by leading people to believe that indulgences could be purchased. This has never been true, nor implied or asserted by the Church.
And they cooperate with Protestants in many important civil matters like electing politicians who are pro-life, pro-liberty, pro-faith, and pro-family.
Indeed, and this is true ecumenism. Standing on the front lines of the abolitionist movement with non-Catholic Christians has been a great honor for me. On the matters you just mentioned, it is the perfect time to set aside our differences and do God’s work as one.
What was condemned by the Church? Burning heretics? That was never condemned.
As I said above, church authorities didn't execute people, but they absolutely recommended it to secular governments in serous cases.