In many cases, taking a government job is no different than using a government road.

If you decide to go most places, it's quite likely that the only way to get there will be by government road.

If you decide to work in certain fields -- like, for example, building roads, or teaching -- it's quite likely that the only way to get work in those fields is to accept a government job (or at least a paycheck that, directly or indirectly, runs through government).