Car-Dependence & View of Public Transit

If you are primarily car-dependent, what is the main barrier/deterrent to using local public transit in your community?

Public transit doesn’t exist?
Public transit exists but is not reliable?
Public transit exists but feels unpredictable safety-wise?
Public transit exists but you’re not familiar with it or have a routine associated with it?
Decent or even great public transit exists but you prefer the private space of your car for commuting?