Well, that is bad. If you don't vote (...especially if many do that), it is the rule of few.
Personally I disagree with that view; the problem with voting is that you are giving support to the views of the person you are voting for - I'd rather not lend my support to someone I don't agree with than lend it to someone who seems like the 'lesser of two evils' as the saying goes; if nothing else if they get a huge backing because of people voting like that then it looks like they have the full backing of the people, regardless of the facts.
Fair play if you want to vote that way, its not like I'll try to stop you or anything, but not everyone wants to give their support in that manner.
(People will always blame the people who didn't vote for the 'wrong' party getting in to power, but often the none voters are spread about in such a way that their impact on the local result, which goes forward as a binary to the national one, tends towards zero.)
Although, frankly, in most of the UK unless you are going to vote for the person who won the last time you might as well not bother - general elections here are largely decided on 'swing seats' with most places being safe. Where my parents live always vote Tory, and where I lived at the last general election I worked out that in order to unseat the guy who got elected last time then you'd need EVERYONE who voted for a different party to vote for a single party AND all the people that didn't vote last time AND a few couple from his side to switch sides... at that point I said 'fuck it' and got on with my own shit.
(I've only voted on 3 occasions; Brexit, proposed changed to AV system and last MEP as in all cases my vote mattered. Beyond that you might as well piss on you ballot paper for all the good it'll do.)