Arnold has at least two monuments at Saratoga and West Point, though neither bears his name.
That said, you cannot compare political differences to actual treason.
The Constitution has a very specific definition of treason. Nothing John Glenn did meets that definition.
Is selling secret military technology to an enemy foreign power treason? Is covering up those crimes treason?
Glenn helped do the first and did the second, If that's not treason, I don't know what is.
You should research Clinton's transfer of MIRV missile technology to the Chinese, and who helped cover it up.
John Glenn's name will pop right up.