Police chiefs have admitted that a second undercover unit stole the identities of dead children as recently as the late 1990s in a series of operations to infiltrate political activists.
Yes, obviously you can in the colloquial sense. But can you in a legal one?
I can see that you can misuse one. I can see that the State might get mightily pissed off with you representing yourself as someone you’re not. You might use a fake ID to “steal” benefits, which would indeed be theft.
But is the identity of a dead person actually property that can be stolen?