Way too short a time frame "rewinding to the 1970s". Try the 1070s, or maybe the 570s. Islam has been a threat to the rest of the world since its founding, actually. In fact, Islam had actually conquered much of Europe by the 10th century, and much of European history of the next few centuries was about ridding themselves of the same invading force that they are now welcoming with open arms.

The Franks were fighting to keep Muslims out of what was to become France in the early 700s. Only Charles Martel's victory at the Battle of Tours in 732 (located roughly in the middle of what is now France) prevented them for expanding farther north.

The Spanish effort to retake Spain from the Moors (the Reconquista) only ended shortly before Columbus sailed West in 1492. In fact, the reason he sailed West at all was to try to get a trade route to far east that did not cross Muslim-controlled waters in the Mediterranean.

The Naval battle of Lepanto in 1571 was a strong victory for Europe against the Muslim invaders, celebrated by the poem of the same name by G. K. Chesterton https://classicalpoets.org/2012/08/19/lepanto-by-g-k-chesterton/

The Siege of Vienna in 1683 finally ended the Muslim expedition into Europe, thanks to John III Sobieski of Poland. The lifting of the siege marked the beginning of the end of Ottoman domination in eastern Europe.

At that point, the Muslims had been sufficiently defeated that they were not a threat to Europe / the West for a couple of centuries, but movements had started within Islam that were troubling by the mid-1800s if one was paying attention.

Hilaire Belloc in the 1930s predicted Islam would rise to become a threat again: https://thefederalist.com/2017/07/20/80-years-ago-hilaire-belloc-predicted-radical-islams-re-emergence-cultural-relativism/

Recent events (and the 1970s are very recent), are not unique. Islam needed no outside help to "radicalize". Territorial expansion is baked-in to it's geopolitics, and what we are seeing now has been brewing since the late 1600s.