Necessary but not sufficient
The term necessary but not sufficient originated in mathematics but is widely applicable elsewhere. It describes a situation in which a certain condition must be true but that condition alone will not provide the solution. In the case of intactivism and men's rights, this is important when addressing issues. It is necessary for intactivists, MRAs to present solid and verifiable evidence. But due to the emotive aspect of these topics prevalent in a large proportion of the population evidence alone is not the solution, but it is part of the solution. The evidence is necessary but it is not sufficient. Along with the evidence other approaches need to be undertaken to achieve the desired outcome.
Some have erroneously claimed that intactivists and MRAs should not focus on facts. It's not that facts won't work, it's that facts alone won't work.