[dspillett]

> it should be easy to correct them

Unfortunately many will read and forward the original post, and be ignorant (sometimes deliberately so) of any corrections.

Looking at it the other way: if responding with corrections is so powerful why not just respond to the post with a "potential misinformation" warning with a correction, perhaps citing sources that show the information to be correct? In fact citing sources in the first place could remove the problem entirely if the information is verifiably correct that way.

> this is about control

Correct: controlling the spread of misinformation.

> not protecting poor Twitter users who supposedly can't decide for themselves

No, it is trying to protect twitter users who won't think for themselves.