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Important: The headset may affect your ability to hear sounds around you. Do not use this headset in situations that may endanger your safety.
Warning: When using the headset, your ability to hear outside sounds may be affected. Do not use the headset where it can endanger your safety.

-User Guide for the Nokia 2128i, p. 15

I get the point, but I don't understand the need for this redundancy.

In the "important" blurb, active voice is used. It's the clearly the headset that's affecting my ability to hear sounds around me. But situations may endanger my safety.

In the "warning" blurb, passive voice is used. My ability to hear "outside sounds" -- whatever those are -- "may be affected." And creepily, it's the headset that can endanger my safety. Can the headset endanger my safety over here? What about over here? Ah! Get this headset off me! I think a better choice would have been "when it can endanger your safety."

Clearly the Nokia User Guide's "Important blurb" and "Warning blurb" committees need to communicate a little more clearly.

Possibly through the use of their headsets.

Important: Roman Catholics read too much into the Pope's new car, a Volvo.

Warning: Too much is read into the Pope's new car, a Volvo, by Roman Catholics. Riding in a Volvo does not normally endanger one's safety.