Muslims are seen as terrorism-supporters by the same folks who love the Saudis.

[🦀🎂🦀🎂]

In the case of the Trump administration in particular, my theory is as thus:

The Trump campaign, as you might expect from a Republican led affair, had the standard planks opposing Iran and its proxies, but seemed to incorporate a lot more themes of a Civilization Clash. This was part of a broader trend in the West; and the Sauds start to panic at the idea of losing their key patrons. They had hoped that the passing of Obama (who they were at loggerheads with) would give them a bit of leeway, but Trump's strangeness put them on the defensive, especially as he seemed to lean on the idea that the US foreign establishment had funded terror through Gulf proxies. So the Sauds quickly got him under his thumb by essentially apportioning all blame for the terror business on its arrogant and ambitious neighbour Qatar. This is partially based on reality. The breed of Islamism funded by Saudi Arabia is ultra-conservative, deferential to authority and even sort of apolitical (although not always), while Qatar has often dabbled in populist affairs that mix political Islam with appeals to social justice and taking down the corrupt order. This is especially useful, as Qatar, apparantly fancying themselves some sort of Switzerland by playing off both sides, had fostered links with Iran; meaning that the Sauds could cast themselves as the heroic fighter of the Qatar-Saudi axis of terror (which doesn't really make much sense in the context of, say, Syria, but that's geopolitics)