are asking how to keep Alarm from being killed without putting it in the ignore list?
or are you asking how does Alarm keep working after you've killed it?
i'm not sure i understand...
if you put it in the ignore list, it won't show up in the kill list anymore & won't ever be killed unless you kill it manually through settings or another app (manually or automatically). if you do not want it to always be killed, you might need to turn off autokill.
if Alarm keeps working or restarting after you've killed it, then some other app or service is probably using it.