Do you have a chapter and verse where Jesus tells us to scrutizine whether world leaders are the anti-Christ?
No, but we have Christ's words relative to the authority of government, and we have Paul's words as well. Plus, Paul said nothing about the most vile government in his history, that of Nero, and, in fact, claimed his citizenship in that government as his shield and protection.
Besides, so much of end time "prophecy" is totally America-centric, as if Biblical prophecy is about the U.S.
Rome was the strongest empire at the time of Jesus and much of prophecy at that time was about Rome, the same was true for Babylon and Egypt. It would make sense that the strongest empire during the end times would be in prophecy, that could either be the US or the EU. Along with Gog and Magog which is probably Iran and Russia.
I actually have always read prophecy in Scripture with America missing from the picture. I don’t see “us” in there at all. From my studies, I believe that we will not be one of the main players in the end days, as we will no longer be a superpower. If we ARE involved, it will NOT be as the “good guys”.