How to find specific buildings in Tropico 4

Turning down the voice volume will stop all voice acting everywhere, but I don't think that there's another way. The voice acting in mission descriptions is almost always the exact same as the text, and they usually only read the first paragraph or so anyway.

You can also turn on subtitles for the radio and election speeches, but I don't think that anything important is in those since you can turn them off in the options. The radio is usually just jokes about recent happenings, and the election speeches are pretty much just speeches.

No, you may be a dictator, but some decisions still belong to the citizens. In the real world, there are plenty of things that influence where someone lives other than convenience. Given time and a nice enough alternative, they may eventually move, but not without some resulting stress (unhappiness).