Countries like El salvador accumulating more BTC isn’t bad in my opinion, this will definitely result in price increase and that’s good one after all.
It won’t be bad for them to accumulate more bitcoin but the thing is they are even among the lowest Bitcoin holders among countries which hold Bitcoin even as they made it a legal tender, their resources won’t allow them to have much more compare to what other countries have acquired through seizure, price increase is not only attached to countries having more bitcoin, as that have more negative effect than positive one.
It's true that it has negative impacts the idea of depositing bitcoin in a country like El Salvador is a very bold and innovative move but it also comes with some risks. Given bitcoin's global acceptance and price volatility it could be a double edged sword for the country's economic security if the country can manage it properly and take educational initiatives for the local population bitcoin could benefit them in the long run.