That's relevant knowledge. It's not the relevant knowledge. Another piece of relevant knowledge is facts about complex things like political science, cryptography, etc. Since politicians actually need to decide and implement things, as a side gig to being popular, lack of the proper knowledge to do so is a shortcoming.
> I would like to know what the public opinion on these issues is
Not big sample sizes, but I regularly ask and interview people from all sides of life, and to a simple question like "Do you think the police should spy on you if that catches criminals?" the answer is always a resounding "no". Especially young people. They just way "No way. We're not criminals". They "arguments" may be choppy, muddy waters, but I don't think peoples feelings about being spied on is much of a mystery.