For those who don't know, Kira are small group of people in Death Note (namely Light Yagami) who have access to killing people with their death note document. They choose to use this to kill certain people such as criminals for their crimes, however bad they are. Their dream is to create a world without crime.
Would you support them? Not just the fact that they kill people, but their ideals about creating a new world?
not exactly: Light jujed that a criminal did what he did by accident, at some point in the story, and chosed not to kill him... U_U
And yes, Kira is a good way to make an ideal world:
Most people are not mature enough in order not to abuse their freedom, so they must feel fear of a "divin" jujment to restrain them... The ones mature enough, can be the Kira(s). After a long term of that, people will eventually mature, to understand that harming each other is pointless, that hatered creates more hatered... Until then, they need to fear some kind of "Kira", be it an occult power, or a death penalty, for at least the most horible crimes... U_U
So, in sum, yeah, I view Light as a Hero (antihero), and if the Kira existed in the real world, I would follow them...