This is because we know what we’re looking for because of what it looks like. We find what we expect to see, and we don’t generally look for things we don’t fully understand. Let’s instead take a non-gendered look at this. Could it be that the suicide rate in men being significantly higher in males than females be a result of abuse we aren’t looking for or even categorising in that way? Now, even asking this question will likely get me berated for ‘trying to make it about men’ - but it’s a point worth considering free from genital bias
For much the same reason we’re very good at catching violent male psychopaths. We’re also not bad at catching female psychopaths who behave like men - Eileen Wuernos, Rose West, Joanna Dennehy…. But there’s no real reason to presume that males have the monopoly on psychopathy. They don’t have a monopoly on other genetic traits - we’ve jumped that gap in understanding autism but we seem to have bypassed thinking about how female psychopaths might behave, how they might cause harm for their own amusement and how to spot this.
Much easier to find a man who punches people to death than a woman who can convince others to punch themselves to death. We have to be very careful about painting one half of the human race as better or worse than the other based on incomplete data.