That's hardly the case.

Firstly, examples of governments that have any people voted in at all are cherry-picked. Around the world, there are governments that are not voted in, or are "voted" in by a sham process which only has the external appearances of democracy.

Secondly, in democracies, a fairly common pattern is that the government consists of some seats that are voted in (parliament) plus some that are appointed (senate). The power is divided accordingly. (A minor point is that it is not uncommon for the leader of the elected party to appoint people for the uppermost staff positions: a so-called "cabinet" or whatever.)

Thirdly, government in the broad sense includes not only the parliament and senate political structure but all of the institutions of the government that actually get various things done throughout the governed region, and all the levels of bureaucracy employing large numbers of people. All of that staff is not elected; they are just people hired into positions and they generally keep those positions across government changes. That bureaucracy has considerable power of its own; not every single decision they make which affects you goes through a parliamentarian that you elected!

For one, as kazinator said in the sibling comment, even in the best democracies this is only true of a small percentage of government jobs - there are many powerful agencies and influential staff positions that are not elected and therefore not subject to the oversight of the people over whom that power is exercised.

Two, yes, many of the highest profile, and most powerful, positions are elected. And in practice, over time, this means that these positions have selected for people who are 'electable' - which has itself over time come to mean people who can raise huge amounts of campaign money. This is a deeply corruptible situation, if indeed it is not already deeply corrupted.

I agree with the idea that open public oversight is a powerful corrective, and is a major difference between private organizations and public ones with effective means for perceiving and removing corrupt officials. I think it is highly questionable to what degree the latter describes our current situation in much even of the democratized West.