I have 2 simple questions for you:
Do you think that certain spaces should be segregated by biological sex or do you think that all spaces, changing rooms, prisons, refuges, hospital wards, should be mixed sex?
Do you believe that women have the right to certain spaces in certain situations where they won't encounter male bodied people?
There are too many possible scenarios to go into depth on everything, but I do broadly believe in self-ID rights to use facilities.
I believe this is possible from a good faith position.
If it transpired that many were abusing the system in bad faith then it would be right to re-evaluate what is happening to establish what has gone wrong. But I don't think this you should anticipate this in advance. Or act in bad faith yourself to give the example of what you fear will happen.
I consider that perception of risk is not the same as actual risk, we all have our own individual risk perceptions and tolerance for risk, and complete risk avoidance is not possible and not compatible with other values that are important.
I trust that there are general mechanisms in place to safeguard people, irrespective of gender, and that these should be robustly called upon.
I believe that investigations to alleged incidents should be taken very seriously in order to prosecute individuals who are guilty of crimes that already exist in the eyes of the law, or to establish if a hoax has occurred so that the perpetrator/s can be prosecuted for that as well, as these have huge consequences for harm and discrimination to vulnerable minorities.
I am not naïve enough to think that women are incapable of abuse, in fact, being in the lesbian community I know about our horrible stats for domestic abuse in lesbian relationships.
I have been very clear on many threads that I view this from an overall harm perspective, and, weighing up all potential for harm for all people, I consider that risk of harm and negative overall outcomes is greater for when trans people are not included.