Although San Diego County is not generally considered a high crime area, it is recommended that anybody who is buying a home should do research on the area that they are considering moving into.
I have provided some links to crime maps and also one that is about sex offenders that was developed by the State of California. Realtors are not legally allowed to comment on specific characteristics of neighborhoods. It may be considered steering or redlining which are federal offenses. I can direct you to sites that will provide you with useful information.

Crime Maps

Sex Offenders (Megan's Law site)

Realtor Websites & Real Estate Marketing