It rhymes! Nice! What about:
Personal protection against violent crime.
Unlike the police, it's always on time.
I don't think you need the word "response", because if you used the aforementioned sentence, 99% of people would understand what you mean. It also interferes with the rhythm of the phrase.
I think the same photo with a black (afro-american) hand would be even more potent as police response time is often considered horribly lagging in black communities.