Writing or researching about a topic on which they feel strongly may be a difficult position for many historians. This is because as a historian, you're meant to provide unbiased information and opinion on any given topic. Granted, in some cases it may be completely acceptable to write with bias. I hope this answer is satisfactory.
It prevents the government from preventing further rights to citizens. It basically give citizens the right to more rights. This allow for the government to grow and add rights to its citizens as time goes on.
