Fair enough. I am not from the USA and I too regard physical punishment for religious error an inappropriate response. Guess that the USA is following the trends set elsewhere on that matter. However, weren't the Tyndale and the Huss matters dealt with before the USA existed? It is, I think, rather tempting to import 21st century mores into the actions of late 14th to early 16th century disputes but doing so is just bad history.
It's fairly bad theology too

So he was in heresy then, right? And he was tried according to the law of the land at the time he went into heresy. It's no surprise, therefore, that he was sentenced according to the law of the land. His sentence was to be executed. Nothing illegal was done to him, it seems.
Isn't it true that a number of USA states have a death penalty and execute prisoners in our own times? Isn't it also the case that among the crimes for which a person might be executed is treason?
So, one can still be executed for doing things against the law of the land, and specifically, for something rather similar to the crimes for which Tyndale was executed - he was not only regarded as a heretic but also as a traitor.
Translating the bible into the English language was not a crime. Tyndale was not a criminal on that count. His crimes were heresy and treason.