There was a study published the other day that found that people who live in PR systems have a much greater faith in democratic systems then those who live in FPTP states. I dont think its any coincidence that the countries which have the most problems with disastrous, reactionary policies and governments are those which offer the least fair systems of representation. Combine these systems with large, right wing media monopolies and you have a recipe for a continuing, ongoing death spiral of politics.
There's so many inputs that went into the Brexit debacle. Toxic media, years of bad governance, austerity, alienation, appaling party politics, incompetence, interference, outright cheating and deceit.. but the even these excesses can be ameliorated by a more equitable franchise. We've been through a ton of that shit as well, but Im happy to say that it looks like we may be on the verge of electing the first left wing govt in the history of the state with not a single right wing candidate coming close to getting voted in. PR is a major factor in that.