Referendums are not democratic. They are anti-democratic.
Referendums are simplistic. Look at the two recent UK examples: the complex and weighty questions of Scotland’s constitutional relationship to the rest of the UK, or the UK’s constitutional relationship to the EU, reduced to the gross simplifcation of “Y/N?” It’s unlikely in the extreme that either of those two options adequately captures the genuine collective desire of the electorate. But while the actual policy space contains many, many more options (greater Scottish devolution within the UK, for example, or greater restrictions on free movement within the EU while maintaining tax harmonisation) the people are not given the opportunity to make their voice heard.
Referendums are majoritarian. Having simplified the question to the point of absurdity, they hand total control to 50%+1 of the population. Democracy is not mere majoritarianism - where two opposing views are closely supported, the democratic solution is mediate a consensus agreement, not steamroller the narrow majority.
Referendums are inimical to debate. By splitting complex questions into two they draw hard and fast lines even between people who are more in agreement than not. Forcing people to be for or against means that the fundamental democratic principle - that citizens have shared interests - is corroded. No campaigner in a referendum can acknowledge that their are cons to their position and pros to their opponents. Instead they must exaggerate their case and denigrate every aspect of their opponents. This leads to bad information (“£350 million a week on the EU”) as the basis for decisions. And we all know what happens when you put Garbage In.
Referendums divide the voters against themselves. All debate is forced into an artificial dichotomy which leads each “side” to view its opponents as enemies and even traitors. That’s not hyperbole - these are the words being used today in the UK.
Referendums are misleading. As we’ve seen today, the public often don’t answer the question asked. People were asked about the EU but were answering, variously, “Do you feel comfortable with our levels of immigration?”, “Are you happy with the current government?” and “Would you like to send a message to the Establishment?”. These are all worthy questions that should be democratically addressed, but the referendum has prevented people from expressing themselves clearly on them.
Referendums let politicians off the hook. They are elected to deliberate, to analyse policy options and to make informed decisions. Sometimes, these decisions will be difficult or unpopular. Referendums allow them to duck their responsibilities and blame someone else. In turn, this leads people to view politicians, and politics, as trivial and superficial.
Referendums also let the voters off the hook. They have the power, but not the responsibility. They can always say - and some in the UK already are - that they didn’t really understand the import of their decision, or that they didn’t really mean it. There is no accountability.
A working democracy doesn’t just require votes. It requires accountability, it requires deliberation, it requires a willingness to hear the views of others, it requires meaningful debate and it requires that complex and difficult questions are treated as such, and not a popularity contest. Referendums cut at the root of all of these.