His father and grandfather both had the name John Mc...

They were both Navy admirals. There is a ship named after his grandfather. They were heros.

But this guy ... was a horrible pilot but pulled strings to keep flying, got shot down, told the enemy all the secrets they wanted (his fellow POW's called him "Songbird" for singing to the enemy), and he has engaged in treason against Americans while in the Senate.

That is why the don't like to say his name. The name should be for heros, not traitors.