Teaching about consent help to solve part of the problem. On one hand, it helps to reduce the rapes where the man considers that there is consent. Example: the old "when women say no, they meant yes". While many men know that women actually mean no, some don't. You would reduce rapes by teaching what informed consent is.

On the other hand, teaching consent helps to reduce "plausible deniability" by men who don't care about consent. Once consent is taught to everyone, you no longer would be able to claim that "you thought she wanted it". It no longer would be believable and no longer would work as an excuse. So it also helps to hold people accountable.

There are many men who do care about consent but would defend men who don't because they assume that since they are friends, that they share values. Teaching about consent helps to bring "light" to the supposedly "grey areas".

Sure, teaching about consent is just a part of the solution and we need to accept the ugly truth that some people have never cared about consent. But the more clear is the concept of consent to all people, the less excuses it would be available to rapist.