Eighty to 90 percent of people are not negatively affected by drugs, but in the scientific literature nearly 100 percent of the reports are negative,” Dr. Hart said. “There’s a skewed focus on pathology. We scientists know that we get more money if we keep telling Congress that we’re solving this terrible problem. We’ve played a less than honorable role in the war on drugs.
The point applies to as well to climate science, foreign aid (which isn't aid) and development (which isn't development) economics, allegedly crumbling infrastructure, education (which isn't education) policy, etc.
Now read Robert Higgs, "All Government Policies Succeed in the Long Run":
Many people, for good reason, have concluded that the surest test of whether a politician or public official is lying is to ask, Are his lips moving? An equally simple test may be proposed to determine whether a seemingly failed policy is actually a success for the movers and shakers of the political class. This test requires only that we ask, Does the policy remain in effect? If it does, we can be sure that it continues to serve the interests of those who are actually decisive in determining the sorts of policy the government establishes and implements. Now, as before, “failed” policies are a myth in regard to all policies that persist beyond the short run. The people who effectively run the government, whether from inside or outside the beast, do not run it for the purpose of hampering the attainment of their own interests; on the contrary.