No you may not. Sexual assualt is a despicable crime and offenders ought to be castrated, but it does in no way neccesitate nor does it excuse false accusations. Furthermore if your argument should have any validity it should count for other crimes as well. In that case what is the comfortable amount of false accusations of murder? theft? or any other horrible crime you could possibly come up with. To top it off lets engage in a thought experiment, lets assume that the false accusation rate was 50%. Lets imagine that a person is sexually assaulted, how serious is that report going to be taken? Now imagine the same scenario where the false accusation rate is 0.0%, how seriously is the report then taken?
I make no excuse, nor is it an argument. I expected the number of false positives to be on par with the number of false negatives. Said otherwise, the number of false accusations is way lower than the number of instances of rape that never even go reported.
To me, it goes without saying that I wish all of those numbers to converge to the lowest possible value.