redirection isn't a solid science, when dart hit didymos the trajectory changed by nearly double what they expected after doing the math, i don't believe it'd be possible to do a precision redirect into the earth without pretty much losing control of what part it's going to strike, about the best you could get is "this hemisphere, probably water" with a wide margin of error. the smart money is on redirecting it away from us so that on the 2036 pass it misses by far more than the close shave we get in 2029. you can't tell the public you're doing this though, which is why the nasa and esa missions appear routine without much attention drawn to them.
United States