That is certainly the view of the security services: anyone using encryption we can't break is a potential enemy hiding something we want to know.
That is why there were export restrictions on encryption technology until it became obvious that was detrimental (crypto developed elsewhere wan't covered, so the restrictions put allied commercial users at a disadvantage to other countries in the industrial espionage stakes without actually affecting the people the restrictions were aimed at at all).
It is also why services that offer encryption are pressured into giving authorities access to the private keys, and those that refuse (or can't due to the design meaning the keys are only in their users hands) tend to get shut down.