I think the first 2 examples do not necessarily affect your personal privacy but the knowledge that there are some checks and balances left. You are right that

I think the first 2 examples do not necessarily affect your personal privacy but the knowledge that there are some checks and balances left. You are right that data leaks/abuse might be the biggest risk concerning the 3rd example. But who would you know if the data is abused or not if journalists can't convince their potential sources that their communication is private? And if you - on some way - get the knowledge that your data is abused, what can you do? Sue the government? That's a lot more difficult if you can assume that the other side has potentially access to your whole strategy and to every mistake you ever did in your whole life (dirty campaigning/blackmailing).