"Most hackers are smart enough to hide their traces so they don't get caught, so getting caught is not much of a problem for them."
Yeah, they are superhuman creatures. 
We are talking about hackers who are psychopaths and/or criminals. No one else would do something to intentionally harm others. These people will be hunted to the ends of the earth and killed if necessary, if they do terrible stuff.
There are enough real problems and crises in the world without making up potential horrors that haven't happened yet, and may never happen. The technology is coming to help millions of people avoid maiming or death, and it won't do to have opponents saying we shouldn't do this or that because there is some risk. You do the best to mitigate risks with all new technologies. No one is arguing that vigilance is absolutely essential. You then learn from the inevitable oversights and mistakes. There is always some risk. There is no free lunch. But saying we shouldn't save lives and make progress because of the boogeyman doesn't cut it.
