I'm not saying that you should give them armoured troop carriers though. You want them to feel safe, not invincible.
If we're worried about officers prematurely killing people how does giving them military-style tools make that any better? If they were going to prematurely kill people before, they're still going to do it. The definition of 'safe' simply moves to a new place. If the OP demonstrates anything, it's that if you give law enforcement these kinds of 'toys' they will find any and every excuse to use them (all under the fake banner of 'officer safety').
Edit: Taking some words from your comment, I guess what I'm arguing is that law enforcement is already pretty invincible.
Fair enough. What I'm arguing is just that LE officers are humans too and they both need and deserve to feel safe in their job, which involves risking their own lives for the safety of the public. But I definitely don't think that they need to go full-military for that. They indeed are pretty safe already.
If all that can happen is the armor getting dented up your not going to feel compelled to shot back so quickly. You will have much more flexibility in responding too. Your initiative is going to get taken away if you don't need to immediately react to a threat.
I do however thing that the carriers should get painted blue or white that someone resemble police colors. The all black and super tactical looking equipment is even too much for me as former military.