No it wouldn't be hard to ask what steps they took.
The difficulty is in proving if they did or did not. You're still right back at square one for many cases, which is 'he said, she said'.
I would argue that is it difficult though. When a man kisses a woman and touches her knee (or vice versa) - where is the consent. Usually nobody says 'can I touch your knee?' it just happens, or the other persons says 'no', but if they don't say no, either because they are starting to become fearful, or because they are ok with it, where is the actual consent given? how do we prove it?
An awful lot of sex is happening where consent isn't expressed verbally. Perhaps it should be mandatory that it is.
But even if it was, proving what was said is notoriously difficult, nigh on impossible.
There's going to be some men who really don't care what the answer is - they intend to have sex regardless.
There are going to be some men who genuinely do misread signs, and will stop once it's pointed out to them, but by then, they may well have already committed sexual assault by touching.
There are going to be some situations where things are getting very heavy (consentually) but a woman changes her mind, and the man has to stop and there is a difference of opinion about the precise moment consent was no longer given and how soon he stopped.
Any law we make has to take into account these situations and what is black and white on paper is no longer black and white in a courtroom when two teams are putting forward two different interpretations of events, signals, timings etc.
Even consenting to sex doesn't mean a woman consents to every possible sexual act, and the entire list of permissible sexual acts is rarely agreed beforehand.
Of course this is a far cry from situations where groups of men have zero regard for themselves let alone a woman and have the sole intention of carrying out their acts on whichever woman happens to cross their path, but it's the difficult grey areas that allow those men to exploit the law. They know it's difficult to prove, and they exploit that difficulty.
If those more extreme cases are difficult to prove, then is this not proof of why more subtle cases are never even brought before the courts - because there is such little chance of conviction?
There's no backpedalling, this is the state of play today. This is why it's difficult to convict. The extreme examples are already difficult enough to prove, let alone the more subtle ones, but I'm trying to explain WHY the subtle cases have an impact on the more extreme ones, and how those subtleties are used in defence cases.
Everything is not as clear as day as you suggest. The 'reasonable belief' clause is precisely why morning after sex isn't always a guaranteed conviction.