Earlier quoted context omitted.
I agree, the ability to lend your strength to benefit others is a moral strength and it's key to human flourishing and achievement. Where I might disagree though is if you think that this is the kind of strength that most users of the phrase in question are thinking of.
TBH all the time I saw this phrase was about strong people in the broadest possible way. And always as a positive. It’s very strange to see people defining strong in very narrow bigot way and then trying to spin the whole phrase into a negative. This thread is probably the first time I saw people take such turn. It’s also very strange that people try to portray being weak as a positive. Sure, strong may have very dif…
This kind of strength - the ability to force your will upon others (which is what military strength is, and also the kind of strength that 'Strong Men' dictators have), motivates the (usually incorrect) comparisons to historical empires. There are other kinds of strength - moral strength, resilience, determination, vision, etc they're just not what I think is being talked about with this phrase.
I don't know where you get 'weakness' is being described as a positive in this thread. Weakness can also mean many things, but in this context, it means being susceptible to others forcing their will onto you. It's not a good thing, but differences in strength are natural and impossible to avoid. What is a good thing is when the great mass of comparatively 'weak' people realise that together they are stronger than the tyrant.
Rather than 1984, for an appropriate comparison I'd go to the Bible: - "God chose the weak things of the world to shame the strong."