In the current environment, false claims probably outnumber real ones 25-1 or more. The incentives to do so are real, and the deterrents to false claims negligible. It has primarily become an economic weapon for women to use against their male competitors.
Say that 100 women are raped, only ten of them choose to report it, but at the same time ten other women decide to file fake rape claims for revenge or material gain. That's a 50-50 ratio of reports, even though the fakes are only 10% of the actual incidents.
The feminist groups are thus lying with statistics to minimize the serious problem we have in this country with with false reports.