Three news articles about three isolated incidents, regardless of how horrific they are, are not sufficient to design good policy. In the US in 2012, "an estimated of 4.0% of state and federal prison inmates and 3.2% of jail inmates reported experiencing one or more incidents of sexual victimization by another inmate or facility staff since their admission to the facility or in the past twelve months".

Those three articles are a drop in the bucket.

Consider that there are N trans women convicts and you're trying to decide where to house them. The relevent number is not "how many women do they rape if you house them with other women"? It's "What is the relative difference in rape stasticics between housing them with men versus women?"

Obviously, any number of sexual assaults is unacceptable. But if housing trans women with men leads to thousands of rapes while housing them with women leads to only dozens, it's still a better policy. The only reason you could argue against that is if you consider a trans woman being a victim somehow more acceptable than a cis woman being victimized.

It's not just those three articles though. When you consider these in the context of other data, such as this from the UK - https://fairplayforwomen.com/transgender-male-criminality-se... - which shows that trans-identifying males have similar patterns of criminality to other males, including sexual assault, the reality of the situation becomes clear: these inmates are not some special type of women who happen to have been born male, but men like any other.

So then the argument is just around the question, should women and men be housed in the same prisons, without any sex segregation? And we already know the answer to that.