NEW YORK ( TheStreet) -- Congressional frustration with efforts to get to the bottom of IRS targeting of conservative groups plainly shows the tax agency is dangerous to civil liberties, irrevocably broken and corrupting national politicians.Investigators on Capitol Hill and in the Justice Department may be able to finger a few malefactors but that won't fix the IRS. The union representing IRS employees is deeply involved in the management of the agency, its leaders have the self-pronounced goal of doing whatever it takes to defeat conservative politicians, it consults regularly with leading Democratic politicians -- including President Obama -- on electoral strategy, and it has cultivated a culture that encourages employees to exercise discretion in ways harmful to free speech and association. Simply, the IRS is not a neutral tax-collecting institution but a collection of grass roots activists, enjoying virtually unchecked sovereign power to destroy the personal reputations and finances of those that oppose liberal ideas, and who inflect terror on ordinary Americans through the arbitrary interpretation of tax rules and onerous audits. Assistant Senate Majority Leader Dick Durbin has openly admitted to asking the IRS to investigate citizens groups embracing conservative views. There is little hope of curbing such behavior or reforming the agency when the Senate takes no action to censure him, and the mainstream media finds nothing much to investigate having learned about this conduct. The only alternative is to shut the IRS and replace the revenue from corporate and personal income taxes it administers. The latter are riddled with special interest provisions that offer low taxes to the rich and powerful and impose high rates on the rest of us. Moreover, the present quagmire of incentives and disincentives distorts business investment decisions and consumer choices reducing economic growth and leaving all of us less satisfied with our lives. And dealing with the hassle and cost of annual tax returns and the constant fear of IRS audits makes all of us less free. In 2013, corporate and personal income taxes will yield to the Treasury about $1.5 trillion and could be replaced by an 11% sales tax on all private purchases -- be they purchases of computer equipment, college tuition or a lunch from the corner takeout.