If Wilde’s play takes aim at the society that persuades itself that it is virtuous and right-thinking while in reality being cold, harsh, and self-serving, it also celebrates the human ingenuity that allows people to make of themselves what they will and to enter imaginatively into another frame of reference or reality, a world in which wit and artifice are paramount. These, after all, are the qualities of which an audience is most aware, having been alternately amused, provoked, and delighted, when it leaves the theater at the end of the evening.
It’s as well to keep in mind what you should not be doing. Do not introduce lots of fresh evidence at this stage, though you can certainly introduce the odd extra fact that clinches your case. Nor should you go on to the ‘next’ issue. If your question is about Hitler coming to power, you should not end by giving a summary of what he did once in power. Such an irrelevant ending will fail to win marks. Remember the point about answering ‘nothing but the question’? On the other hand, it may be that some of the things Hitler did after coming to power shed valuable light on why he came to power in the first place. If you can argue this convincingly, all well and good; but don’t expect the examiner to puzzle out relevance. Examiners are not expected to think; you must make your material explicitly relevant.