Are Senate investigations useless?

          Senate Blue Ribbon investigation on sensational cases of corruption and irregularity in government took center stage in 2004 beginning with the infamous 'Hello Garci' election irregularity involving then COMELEC commissioner Virgilio Garcellano during the chairmanship of Benjamin Abalos and the failed multi-billion NBN-ZTE broadband deal or contract wherein former First Gentleman Mike Arroyo and president Gloria Macapagal Arroyo together with chairman Abalos were implicated.
          It was followed by the P724 million Fertilizer Scam involving then Agriculture Undersecretary for Finance Jocelin "Jocjoc" Bolante and the Euro Generals that traveled to Moscow wherein PNP General Eliseo dela Paz and his wife were caught carrying undeclared 105,000 Euros in his possession at the Moscow airport.

         Then there was another investigation on the Jueteng Payola expose of Sandra Cam, the recent expose of retired Pangasinan Archbishop Oscar Cruz also on Jueteng implicating an undersecretary appointed by President Aquino and now the expose of former AFP budget officer retired Col. Rabusa about corruption in the Armed Forces of the Philippines allegedly implicating three retired Generals and former Chiefs of Staff, namely: Angelo Reyes, Deomedes Villanueva and Roy Cimatu, who was appointed by former president Arroyo and reappointed by president Aquino as Special Ambassador on Middle East Affair.
         Most if not all of the anomalies happened during the presidency of Gloria Macapagal Arroyo in her nine years holding the reign of power. The Senate in the exercise of its power in aid of legislation conducted the investigations under different Blue Ribbon Committee Chair spending time, effort and millions of taxpayers money for expenses during the many hearings it has conducted as well as for providing security and protection to the witnesses like whistle blower Jun Lozada, Sandra Cam and others.
         The question is: Whatever happened to the Senate investigations on all the past anomalies and graft and corruption? And what will also happen to the current investigation on the corruption in the AFP? Can the Filipino taxpayer expect good result that would lead to the filing of charges and the final conviction of the Generals involved? To this day nothing turned out of the investigations that people are satisfied.
         The government is equipped with more than enough laws such as the Anti-Graft and Corrupt Practices Act and other laws that are applicable to send the crooks and grafters to jail. The Justice Department has all the power to file the charges in court against people implicated by witnesses and it has the best prosecutors who could devote time to cases assigned to them to see a conviction. The Judges handling the cases in Court have sworn and are duty bound to speed-up the cases and render a verdict so the ends of justice is served.
        The Supreme Court being the last bulwark of justice and democracy is also mandated by the Constitution to uphold the law and protect the State from being unduly prejudiced by acts of graft and corruption committed against it by unscrupulous and dishonest public officials.
        So why should it be difficult for the government to hold public officials accountable and answerable to the people applying the many laws of the State if they commit graft and corrupt practices? Why is it that despite many investigations already conducted by the Senate, the House of Representatives and the cases already filed in Courts, still hardly we see the conviction of high government officials?
       Is it accurate to say and imply that Senate investigations are useless because the government suffers from from a culture of graft and corruption?