Nah, hurry up Bennu! Give the "Human" race what it deserves!
hope you get it in the forehead first!
If you start to have these feelings too often, please get help. You could be a mass murderer in the making.
There is still time to do some volunteer work and help others..
A rock that size will be bad news for the country it hits, or adjacent maritime areas, but it's not a world-killer. Chixalub (the dinosaur killer) was a lot bigger.
As for deflecting something that size? Entirely doable with a few decades warning. You just have to quit dithering and actually build and fly the hardware.