The first four are pretty clear. The fifth needs some explaining. Think about this, tree roots don't have brains. They can't possibly know that there is water down there. They don't know there are wet goodies in your sewer pipes, and they won't break the tiles to get to it.
Tree roots are opportunists, though.
They will flourish in environments where there is available moisture and nutrients. They will enter a sewer tile if a crack is already there. They may make the crack worse, but they will not cause the crack. I digress about sewer pipes to make the point that tree roots need to be watered where they are. Think about the basics above and water accordingly.