Phone Tapping

definitely not, it should not be encouraged...

Yes it is necessary sometimes.

If they can get a judge to give them a warrant to do so, then yes...

If you are not violating the law of the land where you are living or do not think of harming any one, then what makes someone tapping your phone. Let Police do their job. Who we are to decide whar should they do. Do not perceive any system harmful to you without any reason or bad experience is makes us specimistic.