Technology

Not really, no. While an ideal utopia might successfully eliminate psychopathy and all related disorders falling under that umbrella, or at the very least totally prevent its affects on society, we are not in that ideal utopia and likely won't reach there as we don't know what genetics precisely cause it (mainly because rich people do not contribute DNA for research.)

Until we can either safeguard society from its affects or eliminate that particular defect from humanity, whichever is possible, we cannot eliminate capital punishment. There will always be another day, and normal humans are quick to forget and forgive, not to mention just be miseducated on the subject. Just see the deification of figures like Henry Ford, Ted Bundy, or Henry Kissinger for examples. While all but the last had their reputation resurrected long after their death, Kissinger shows this reputation can be changed or hidden from the masses in real time during their lifetime.

Life imprisonment then becomes a Sword of Damocles instead of a solution for these people that objectively, by all current scientific research, cannot physically change what they are or how they think and act. Eventually that Sword will fall, the public will forget, forgive, or be misled about their crimes, and they and their fans and enablers will be free to do their crimes again.

I agree capital punishment is not ideal, no state should have that power, but then again there shouldn't be states, period; but as there are and we have to live until there's not... we must have a solution for those that harm masses of workers.

That solution is their crimes being laid bare, a public representative lawyer having every chance to defend them fairly, and a jury panel of either judges or the public deciding their fate; allowing the state to execute the will of the people before the people take matters into their own hands — which is another point to be made; These people will die if they continue their crimes. The people will enact justice with or without the state, and for all the reasons above imprisonment is not seen as justice to those wronged badly enough.

It is much better to have a system handling this than relying on heroes like Luigi Mangione, may his innocence be held up in court, to handle what needs to be handled.