He *allegedly" did those things. Part of the problem here, and with the death penalty generally, is the apparently general presumption of his guilt. He has not been to trial yet. Under US law, he is to have the presumption of innocence until proven guilty (as it is entirely possible, however unlikely it may be, that they have the wrong guy or that the charges do not reflect what actually happened), and so it is unreasonable by any measure for the federal AG to be stating that they’re pushing for the death penalty before he has even been federally charged.
Further, he didn’t plead “innocent”, as thats … not a thing? He pled “not guilty”, to the charges, which doesn’t intrinsically mean that he’s denying what actions were accused, but only that he believes the legal charges are not commensurate/congruent with whatever actions he did take (which, again, may or may not even include what he was accused of, cause it could be the wrong guy or an innacurate charge, hence why we have trials in the first place). E.g., someone who killed in self defense but was charged with murder would obviously plead not guilty even if they did in fact kill the person, because killing in self defense is not murder by any legal definition of either. Moreover, “openly denying any wrongdoing” would be entirely appropriate to do if he is in fact the wrong guy and he didn’t actually do anything.
Egads, that poor child is probably going to have significant scarring around the cuts. Assuming he didn’t get a massive infection that they didn’t bother to get treated until amputation was necessary.