By now it is clear that they are protesting just because they don't understand about Bitcoin. Elderly pensioners are very easy to manipulate, as they always listen to rumors and propaganda without any basis. In this case, they have no reasons to worry about, since the government is only adding one additional option for payment. It is not taking away any of the existing options. But the regime has failed in making the citizens aware of this. If the people really understand what the new law does, then they will have no reason to protest.
I think that the citizens who are most against it is because they do not trust the economy that BTC represents, they may have a financial culture where "Safe" is the right thing to do, that is, they trust stable things, where there is no volatility, they They see more disadvantages than advantages in BTC, they do not see the possibility that if they have an investment in USD it can increase when BTC rises, they think that their money will be devalued, it is understandable. The government must take training measures and financial culture of BTC, so that people do not stand against the only tool that will make them financially free and leave a traditional economic system where debt is the main denominator, I think it is a question of time while people enlighten themselves.