Having done a fair amount of research into this topic, I can tell you that crime is *fairly* evenly distributed throughout Hayward, and Hayward's overall crime rate is slightly lower than the national average. However, I still consider Hayward to be a moderate- to high-crime city by Bay Area standards.
The best way to understand crime in a neighborhood is to spend a few hours driving the neighborhood and talking with residents. Ask them about the sort of crime that occurs in the area; ask them if they feel safe; if they say crime in the area is low, ask them where crime *does* occur. Probe for details.
I've posted two referrence documents on my website for you. The first is a breakdown of crime in Hayward as a whole, from homes.com. The second is a breakdown of crime "per beat" in Hayward. Tyrell is in Beat G.