Japanese ham is probably horrible. Just like the "amerikan doggu" (hot dog/corn dog) that I used to find in Tokyo convenience stores, it probably does not in any way resemble actual ham.
No, they're just learning to speak English. Japan is our best colony, and this is the sort of thing colonies do. You should know that - you lived in Alaska, which used to be all Eskimos and seals. Then it turned Russian, then it turned American. Is it bad when Alaskans call Mt. McKinley, "Mt. McKinley"? Is it silly for Alaskans to say "ham"?
I'm just goofin. I just wish Japanese were that easy.
McKinley was a terrible name. Its as bad as when a German climbed Mt. Kilimanjaro and named it, "Kaiser-Wilhelm-Spitze".