The authenticity of 1 Thessalonians 2:14-16 is challenged by some on surprising grounds – mostly because some scholars have a preconceived idea of what Paul can say and they can’t fit this into their view, and what Paul says seems historically premature. There are fundamental flaws in that. But what are those sceptical of the passage surprised by? Simply that Paul is condemning towards the Jews he is talking about, whereas he writes elsewhere more optimistically about Jews in general, and it seems premature for Paul in the 50s of the first century to talk about God's wrath having happened, if we presuppose that the only wrath that happened to the Jews in the first century is the fall of Jerusalem in 70AD. That’s the critics' argument, the “it doesn’t sound like Paul to us, and it’s premature” argument.
Here’s why it falls apart. First look at the passage: