I'm sorry, I find this manga really refreshing. So many isekai MCs are confronted with terrible systems/conditions in their respective stories (most common one is slavery), things that no first world adult would accept, and just go with it. These kids are at least trying to change the blatent wrongness of their new world.
As for the whole democracy thing, our democracy (the US anyway) started in similar technological circumstances and probably worse literacy rates. Tsukasa also seems like the type to think in the long term, not necessarily democracy tomorrow, but like democracy 10 years from now. This offensive is just the first step in that direction.