I don't think fire alarms is the right analogy. More like an Amish person getting antivirus software for their nonexistent computer.

That's a broken analogy because everyone has the 'computer,' which in this situation is cells which are capable of being infected.

	▲	apparent an hour ago \| parent [-]
		It's not clear my analogy is more broken than yours, which is taken to task elsewhere in this thread. You can't get an STD because your neighbor has unsafe sex; your house can burn down because your neighbor smokes in bed.