On this day, the USS Liberty was attacked by Israeli Air and Navy forces

why is it when some die, they are your brothers, but others, they are "losers" according to Trump?

Maybe because Trump never said that.

no, he did say when asked to visit a cemetary of those killed in wartime, "why would i visit the graves of losers"?
Still remains, even without Trump in the question, why are those killed on the USS Liberty any less than those killed now?