Microsoft Corp made its most vehement and public attack on Google Inc on Friday, calling its internet rival's actions potentially anti-competitive, and urging victims to file complaints to regulators.

The irony of  Microsoft trying to squelch competition via the antitrust laws is amusing. 

But the incident illustrates one key negative of antitust: companies that are losing in the marketplace encourage Justice or the FTC to prosecute competing firms, often with dubious justification.