The people that are protesting might be doing that for majorly another reason. If a government is not performing well, the people won't happy with there policies. Perhaps introduction of the use of bitcoin may be one of the policy that the people don't understand. El Salvador government can't just make policy and force it down the throat of the people. The government need to build trust by sensitize and reorientate the people about the use of bitcoin and the benefit especially investment opportunities.
The government are trying to balance the live of it citizens but is like things are going out of control looking at there claims of the protesters of them being the losers if eventually their salaries are paid in Bitcoin and it price falls suddenly, the effect will be much on them especially to a family man that has huge responsibility to handle.
They'll have the right to protest against the policy because Bitcoin is not stable and the tendency of waiting for the price to come back to it original value might be time consuming causing severe problems to individual workers who has something to do with money.
This problem need to be resolved if care is not taken, it could lead to conflict that can escalate to something else. The government has to look into this policy to adjust it, prohibiting the payment of workers salary in Bitcoin.