The American system is one that can be changed with a popular vote. Further, the competition between the two parties and the bid to be re-elected causes them to make decisions that are good for the country so that they are credited for that by the people.  Whilst the process does have flaws, it is illegitimate to call decisions made by the process unjust when the process is a clear process that can be accessed by everyone and can be changed if results are seen to be consistently unjust.  If the Republican voting base acts in the way that the proposition suggests it might simply be that the Republican voting base dislikes tax increases for reasons the proposition has not considered, such as a slippery slope effect where tax increases for the rich eventually make it more acceptable to increase taxes for the poor.