It saddens me to hear all of these negative experiences around this area. Nothing worse than hearing about an area you grew up in going to pot. Especially sorry to hear about the murder, and about John's bad experience in GG--we used to attend church right next door to there.
While the area around the Mouse can be rough, it turns out that currently, Anaheim as a whole runs at 0.66 times the national average for violent crime (per capita), which puts it somewhere in the middle of the nearest surrounding cities (Garden Grove 0.72; Fullerton 0.47). (This map shows the location of the shootings mentioned above compared to where Disneyland is http://www.spotcrime.com/ca/anaheim
Of course, statistics mean nothing when you are looking down the barrel of a gun. I guess one's comfort level in terms of getting around depends on how familiar you are with the lay of the land. It's really too bad that such heinous crimes are going to discourage folks from enjoying the rest of the city and surrounding areas.
The whole thing just stinks.