Weeding out potential tax cheats is not reserved for conservative political front organizations. The IRS uses profiles on all tax returns. Recognized indicators of potential fraud are flagged for review. Items such as extreme changes in income or unusual deductions will get you audited.
The situation with these political front organizations is not at all surprising. The whole money equals free speech movement was pushed by wealthy conservatives for years. Once they got their "Citizens United" ruling from the Supreme Court there was no holding them back. These tax exempt "non political" organizations started popping up over night like dandelion weeds in America's front yard. It would have been irresponsible of the IRS not to look at these organizations with a jaundice eye. To do otherwise, would be to deny reality.
It is likely, when this is over, that the IRS will be told to back off on audits of these types of organizations, just like with the churches that regularly violate their tax exempt status by advocating for one party or the other. In the end it will be considered another victory for unbridled greed in this country and ever increasing control of our state and federal government by wealthy and powerful Crony Capitalists.