Is this worth being in a gang?

Out on my bike today in South Tucson, I spotted this series of murals in the alley between 30th and 31st Streets, just east of 3rd Avenue. It's on the back (north) side of Capilla de Guadalupe. Here's a satellite view from Google Maps.

The photos run from east to west along the alley; the first photo shows the whole series, and the others show individual parts. The original murals have been partly trashed by taggers — including the part that gave me the title for this blog entry. The only date I found was '94, though the tombstones are all dated in the early 1990s.