I believe that the benefit may be that the candidate(s) would be more accurately elected because every citizen would have exercised his/her rights and selected the most worthy candidate. However, I think the risk could be great as well. For example, many legal voters are uninformed, and this could lead to uninformed voters choosing a careless candidate. This is due to the fact that he/she would be mandated to vote.
pomoge ci poprostu powiec mi jak sie ta ksiaszka nazywa
That would be changing beliefs. because motivating a peace activist to action would mean motivating them to protest peace.
weakening their attitude would result in a sedentary and apathetic response. and strengthening their values would be making them even more of a pacifist. therefore you most change their beliefs before you go forth with any of the other options.
hope this helps!