Here's my thoughts. I don't think Kendrick editing out "we hate po po" was an act of cowardice, it was him censoring himself for the sake of not distracting from the big picture (his perfomance). They just said that Beyonce's "Formation" was about killing cops (which it wasn't) and that it was anti-cop (and again, it wasn't) and were all up in arms about it. Now that Kendrick line isn't something you could twist or misconstrue because "we hate po po" is a part of the lyrics. It's definitely something that could be considered "anti-cop".
Personally, as an artist, I wouldn't edit or censor anything that I wrote. If I wrote it and it was released, then I'm performing it as is. People will have an opinion either way. If people get offended, then it's on them. Being an artist, you're supposed to inspire whether it's motivating people, making them dance, making them think, or even offending them or making them feel uncomfortable. You have to take the heat along with the admiration.
remember the fake ass Schoolboy/Kendrick fight?
remeber the BET awards after Section 80 that was basically a Kendrick Lamar commercial?
TDE is all about PR stunts. They didnt want that jew hand this go round.