Transparency of Lobbying, Non-Party Campaigning and Trade Union Administration Bill

I had hoped that we would get an explanation as to why this part of the Bill is essential. If the only argument that can be made is that the public should be able to complain about a controversial ballot, surely if it was that controversial it would be taken up by the trade union movement and a trade unionist would object to it rather than wait for a member of the public to do so.