Coconutty I think it's right to treat a victim with support and respect and let them decide themselves what is best for them.
Sexual attack or rape is an act where the victim's agency and right to make decisions about their own body is ignored, so my feeling is that it is healing to totally respect their agency and decision making powers. I think it is also healing to focus on that person and their needs and make them the centre of what is happening, not to focus on the potential needs of others.
I would really never tell someone to report an attack or not to report an attack- they know themselves what is best/safest/possible for them. I would then support them in whatever their decision was, or if directly asked, help them find sufficient information to make an informed decision about whether to report or not, one that takes into consideration things like their safety, how well police in that area are equipped to deal with such reports (i.e. will they take it seriously, will the victim be exposed to a lot of disbelief/harassment) and so on.
Fundamentally, when someone is traumatised by an attack, I think any kind of pressure is unhelpful. Anything that might use what could be perceived as an attempt to guilt tactics to influence a decision is also unhelpful.
I do also believe that sexual predators should be held accountable for their actions and punished appropriately. I think the right way to apply pressure to make sure that more predators are caught and held accountable and that the way the police service and legal system better meet up with the needs of victims after an attack, is to lobby for/campaign for reform of/better resourcing for the police service and legal system, or a change in law, or for a change in societal attitudes.
At the moment, although things (in some areas) have improved vastly, there is still a big disconnect between the way system operates from a police/legal point of view and from the victim's point of view, especially about emotional and physical needs.
I think applying pressure to someone who is already reeling from an attack is usually well meant but also usually ultimately counterproductive for that person. As a society, we should shoulder the burden for change in attitudes to sexual violence, not make it the responsibility of the victims, who have already been given a huge burden to carry.
If it is right for person's recovery and safety that they choose to get involved in that process, then that is another thing. That is entirely their choice and something we need to get better at as a society before we start talking about duties to report etc. (especially when there is such a big discrepancy between reports and prosecutions already).