It can be outlawed and as a result prevent access to encryption for a large part of the population. Then only technically capable people and motivated criminals

It can be outlawed and as a result prevent access to encryption for a large part of the population. Then only technically capable people and motivated criminals would be in a position to use it. The govt would then conflate all encryption with terrorism. If you were found with encrypted communications you would be compelled to give up the key or face prosecution as a terrorist. In front of a jury with no knowledge of encryption other than what they heard on Fox news would guarantee a long sentence or the usual tactic of forcing you to take a plea regardless of your guilt.