Well, English is the most global language after all - talking about countries where it's taught, and that it's accepted as the common ground for most negotiations and such. Other languages are spoken by more people, true, but at least there's some point in it.
About driving - here in Ecuador, you have to pass all tests in Spanish, no matter where you're from. They do accept foreign drivers licenses for up to 6 months - after that you, have to get the local one. Europe has a unified license system, so you're license is accepted anywhere - because it's a standard. People here drive very differently than in Europe. It's taught differently. The whole perception of driving is different. If someone doesn't speak either the native language or the common ground language (english), how to make sure they understood everything in the license test? How should they be expected to communicate in emergencies? With police? There are many ridiculous decisions made by the POTUS, but based on the little I know, I can see a reason for this one. Although it's probably just fishing for xenophobia.
What are the factors included in the evaluation of what a good person is?
A person is to consider "good" when acting coherent with the predominant set of values in the culture/society that they live in - judged by society. A person can consider themselves good when they are coherent with their own, intrinsic set of values.
And what is the reward for being good?
Happiness. If we act coherent with our values, our subconscious is not nagging us all the time about working against what we are. The more coherent we are, the happier we are.