So you're trying to compare a standoff situation by a bunch of yahoos to a kid that looked very much like an adult pulling out a firearm on a police officer?
Uh, yeah.. Guys with real guns are a lot more serious than a child with a toy.
It's not a wonder why you know nothing about police procedure. You think they plan their actions according to race and not the situation. Well I have some bad news for you, and that is police treat immediate threats differently than hostage or standoff incidents. When somebody all of a sudden pulls a gun out in front of you, you don't have time to sit there and talk him out of it. You have a fraction of a second to respond, and if you don't respond the proper way, your family might be burring you in a couple of days.
Except Tamir didn't have a gun. He didn't pull a gun. There was no one else in that park and he wasn't an immediate threat. Oh, yeah, you can look at this video and tell this is pretty obviously a child. We can also talk about how they didn't render first aid for four minutes, and how they threw his 14 year old sister into the back of a police car.
We can also talk about how the cop involve was fired from another police department for emotional instability and being unable to handle his weapon on a range.