Of course he already has an opinion formed, which is that it obviously isn't 'haven't we all done it'. In doing so he brings back into view the simplicity of the situation and questions the possible hypocrisy of some of the audience. Also his use of the word 'wag' gives a much less worrying feel than the jargon like word truancy. He attempts to make a point that at times he believes absence from school can be justified, describing them as 'Mental Health
Of course he already has an opinion formed, which is that it obviously isn't 'haven't we all done it'. In doing so he brings back into view the simplicity of the situation and questions the possible hypocrisy of some of the audience. Also his use of the word 'wag' gives a much less worrying feel than the jargon like word truancy. He attempts to make a point that at times he believes absence from school can be justified, describing them as 'Mental Health