Yes. Sexual assault is very expensive, in terms of post-assault medical service, legal services, and human suffering. Self-defense training, in contrast, is quite inexpensive. A recent Nairobi-based study found that comprehensive self-defense training cost US $1.75 for every assault prevented, compared with an average of US $86 for post-assault hospital services. Given the higher cost of medical services, it is likely that the savings would be even greater in the United States.
Sarnquist,Clea et al. 2014. “Rape prevention through empowerment of adolescent girls.” Pediatrics peds. 2013-3414.
From Women’s Self-Defense Frequently Asked Questions. Jocelyn A. Hollander, Ph.D. University of Oregon, September 15, 2014.