OK, I'll accept that you are more consistent than I gave you credit for. My apologies; still, I think given the Trump quote above, I can be forgiven for making the point in general even if it's unfair to direct it at you personally.
I'm not here talking about the 50%+1 threshold precisely; I just checked, and as far as I can see it was only reached twice since January 1900 (October that year, and 1931). It doesn't bother me particularly as that's probably not achievable if there are more than two parties. What I really get annoyed about is when the "winning party" by the popular vote measure doesn't win by the seats in Parliament measure. This has happened in the UK in several elections (again, since 1900, which is an arbitrary cut-off but I can't be bothered to look at all of them): the first election in 1910; 1929; 1951; February 1974. There's also been several cases where the third party did awfully despite getting a lot of support: 1983, 2005, 2010 (Lib Dems) and 2015 (UKIP) being the worst examples of this in recent times.
Look, I can sit here all day and happily (and I mean happily) pore over the statistics of recent elections in the US and UK, and explain how badly one party could do in the popular vote and still win -- or how well and still lose -- but none of it really means anything if you can't accept the basic premise, which is that any system of government ought to represent the people who elect it. But in the US it does not: it is not, as Lincoln had it, "of the people, by the people and for the people", but it is of, by and for the states. In the UK, government also does not truly represent the people; it represents the MPs.
In practice, the system in both the UK and US tends to work out "close enough" that the fundamental flaws are generally well-hidden. The circumstance in which a US president can be elected on less than a quarter of the popular vote are extreme, of course, requiring a majority of one vote in forty states, and exactly zero votes in the other ten. This will never happen; the margins of "failure" of the system to elect the people's winner are usually very small.
If you don't accept the fundamental premise, then nothing else I can say will matter. What will it take to change? I suspect a result so drastically awful that it exposes the frailties of the system once and for all. A Corbyn victory, perhaps, despite having a clear and obvious minority of the popular vote?