I doubt the majority of the British electorate knows a great deal about anything they're asked to vote on to be perfectly honest, and I include myself in that. If you think about the typical manifesto, they usually identify a problem (or more commonly a whole bunch of them), they propose various solutions, and then highlight why they're the best people to implement those solutions.
We're then asked to judge based on all three of those areas despite having absolutely no clue about any of them bar tribal loyalty, the sniff test, or what we're told by others. It's not really a surprise that we get such utter bellends in charge of things.