They have a partial audio transcript from the body cams, and it shows that they were actually trying to help Floyd. One cops says "I'm worried about excited delirium, or whatever", "should we turn him over in his side"? And then officer Chauvin says "no, that's why we have him on his stomach".

So, they were either trying to not kill him, or they were just saying those things on the body cams so that they could murder him in broad daylight, with people filming and watching. Which makes more sense?