Police are powerless when compared to people. Tonight is all the proof you need of that.
I wonder where you have taken these sentences from.
The noun "police" requires the definite article. Also, when pointing out differences rather than similarities we tend to use "compared with" rather than "compared to." Also, does that sentence suggest that the police are not people?
As regards the second sentence, the adverb "tonight" is not a suitable subject.
I'd rephrase the whole text as follows:
The police are powerless when (compared) faced with angry citizens. What (has) happened tonight is all the proof you need of that.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .