Self-appointed "compassionate" people who feel entitled to use the "government as a tool" to advance their personal moral agendas have historically given rise to tyranny and are among those most to be feared by a free people.
Secondly, all those who govern use government as a tool, whether it is a conservative who uses government to pare down the federal bureaucracy or a liberal who uses it to subsidize social programs. Government is a tool for governance, plain and simple. It is an instrument for achieving a desired end. It is going to be used by someone. It just depends on by whom and for what ends.
In the same way, all those who govern, govern according to their morals. To expect them to do otherwise is ludicrous. You may agree or disagree with the morals of those who govern but to think that you can elect governors that are moraless or, even worse, amoral is misguided. Abraham Lincoln was guided by his morals. Ronald Reagan was guided by his morals. A leader who has strong moral conviction around those principles which are essential to good government are about as far from tyrants as you can get and will always get my vote.