…but because the basis to refuse to answer questions posed by law enforcement is grounded on long-standing constitutional principles, which sadly, many today do not know.
Understand though, that the above video depicts exchanges at inland checkpoints, not ports of entry. The latter being a very different place.
Disclaimer; I failed Con-law 101 the first time I took it, long ago.
Very good educational resources, brought to you by Hillsdale College.
And, if you like to Read.