Our country was founded as a constitutional republic and not a democracy.
Our Founding Fathers recognized that a pure democracy was mob rule where a bare majority could oppress the sometimes large minority. To counteract this, the Senate was constructed to give more power to states' rights and was never intended to be a pure democratic body. It was intended to let small states have a bigger say, and to make it harder for the federal government to impose onerous regulations and laws upon them.
By making it a requirement to pass important legislation, 60 votes would be needed. The filibuster is the process that protects this ideal. (The other part of this ideal was that senators were elected by state's legislatures and did not have to grovel for the popular vote. Elected senators were to be true to their state's ideals. But this was eliminated years ago.)
By voting to eliminate the filibuster process for certain issues, our senators have further eroded Hawaii's influence in government in favor of transferring that power to the particular political party in power. Once again, they have demonstrated that they are political yes men/women and do not belong as our elected representatives as they don't seem to understand that protection for the minority must be retained.