A quick question for AC Peeps: Market failure

[Nielsio]

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In reality, the consumers lack of knowledge about certain speciality type services (e.g. electronics repair, surgery/medicine) may be a far worse (but related) problem than the problem we usually think of when we hear the term "Monopoly". Certainly, Spillovers are more important than either one.

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If the state is so great at electronics repair, surgery and medicine; why does it force everyone to use it and pay for it at gunpoint, and shoot and kidnap anyone who tries to compete?

Surely if it's so great the people will choose it voluntarily.