Having read a couple of popular histories of the CIA and knowing how they thought about how folks like me live in the world, it is easy to understand that they are decidedly not acting in my interests.
If you find the interests of the US power to align with your own, that's probably pretty normal for US citizens. But even just looking at Paperclip and Phoenix, I'd be sad to be aligned with either of those crimes, and that's not even looking at the horrible outcomes of their work in Guatemala, Indonesia, Laos, Cambodia, etc.
The CIA is a pretty handy thing I suppose, as it's existence has convinced me that the US gov neither has my interests in mind nor represents me in any meaningful fashion.
Given the fact I think that they have done an immense amount of harm in the world, that fact has made my conscience much lighter.
How is that even a question?
More than other intelligence agencies? Extant or historical?
Intelligence is messy. Here. And among our enemies. We have to contain that messiness domestically, to keep it from consuming us. In that way, it's analogous to our immune system. And just like our immune system, turning it off means all the other out-of-line elements around the world now have easy pickings over you.
The CIA has been more destructive than other modern agencies because it's far reaching. It's not more evil than other ICs. Just more capable. I'm not thrilled to learn who occupies that vacuum if the CIA goes away; almost by definition, it won't be anyone benevolent.
If CIA ends up hurting for money they can go back to using Israel to sell weapons to Iran and selling cocaine to intercity youth.
Like the good old days.
There are maps of this new world regularly published by US think tanks.