Mass killers who received death penalty

Has anyone noticed how rare it is for even convicted mass killers? It's much more common among serial killers, but for mass killers it's very rare. From 2000 - 2017, only 2 mass shooters were given the death penalty (Nidal Malik Hasan and Dylann Storm Roof). You also had the Boston bomber suspect Dzhokhar Tsarnaev who was sentenced to death and maybe John Allen Muhammad (although he was more like a serial killer). And that's not counting current trials. For 9/11, Khalid Sheikh Mohammed, Walid bin Attash, Ramzi bin al-Shibh, Ammar al-Baluchi and Mustafa al-Hawsawi are all facing the death penalty, and their trials are projected to begin in Jan. 2021. Initially, nearly 800 people were sent to Guantanamo, but as of now, only 40 remain. Most inmates were freed and sent back to their respective countries. As for others, Patrick Crusius, Nikolas Cruz and Robert Bowers are still awaiting trial, among others.

I think the reason so few mass killers get the death penalty is because most of them either kill themselves or are killed by police on scene. That, and mental illness.

You don't hear about little mass murders (3-4 dead) in other countries. It's not rare, it's rare maybe only for West Europe and USA with Canada.

Billy Cook murdered a family of 5 and some time later killed another man, but only got the death penalty for the murder of the 1 man due to being in a different state with the state laws at the time (he was sentenced to life in prison/300 years for the murder of the family), funny old laws

Eric Houston was sentenced to death and is currently on death row awaiting excecution.

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Richard Poplawski (2009 Pittsburgh Police Officer Shooting) is currently on death row in Pennsylvania.