Yes, this will be used to suppress protest
Jon's concern about this type of weaponry being used to suppress legitimate protest is a valid one. While police might not resort to using rubber bullets, tear gas and tasers to disperse a protest crowd for fear of the public backlash resulting from death or injury to innocent bystanders, this sort of weapon makes it easy to incapacitate a crowd without doing any lasting damage. Such "safe" weapons, precisely because they "don't leave any marks", are more likely to be used against protestors without fear of public backlash.
But it's not a case of "Police state, here we come." The police state is already here and has been for some time, actually. And it isn't going to go away. As George Orwell so rightly put it, of the "proles" or common people:
"Until they rebel, they cannot become conscious, and they cannot become conscious until after they have rebelled."
But with weaponry and technology on the government's side, even conscious proles would not be able to rebel. Rebellion is no longer possible.
In the face of that knowledge, our governments can do what they like with impunity.