The Roman Empire survived for centuries, but cracks of its shell started to form. Economic troubles started brewing which made the burden of spending on the military tougher than before, and the gap between the rich and the poor widened. Political corruption increased among the government, leading to instability within the government and military, assassinations of political leaders, and the split between the east and the west. The barbarians that the Roman Military had to put up with for centuries started becoming a bigger problem for the Military that was already being weakened by the other problems the Roman Empire was facing.
Another socio-political aspect that likely contributed to the inner rift of Roman Society that contributed to its collapse was the emergence of Christianity. The religion of the Roman Empire was Roman Polytheism that consisted of multiple gods such as Jupiter, the God of Thunder and the Sky, Mars, the God of war, Venus, the God of Love. However, Christianity which started off as a sect of Judaism began to emerge, it was Monotheist, meaning it held the belief that there was only one God above all. Some of the Roman pagans who wanted to preserve the state religion viewed Christianity with skepticism and even some hostility. The Christians also had hostility towards the pagans as demonstrated by the fact that there is documented evidence of them destroying statues of pagan gods.
This mirrors the behavior of wokists today who ironically do the same thing now to Christian statues. There were critics of Christianity such as Celsus, who described Christianity as a religion that consisted of low status people such as uneducated low-class workers like wool-workers, cobblers, laundry men, who would pull aside children, and gullible women indoctrinate them into Christianity and tell them to go against their fathers and teachers. Sound familiar?
To add to that, there are some parallels between Calvinism and Leftism:
Humanity is fallen and unable to choose God (correct leftist worldview) apart from divine grace. (educating yourself) Sin (racism) affects every part of human nature, making people incapable of saving themselves.
God (the leftist collective) chooses individuals for salvation based solely on His (their) will, not on foreseen merit or human decision.
Christ’s (Leftists) atoning work is intended specifically for the elect (leftists) and effectively secures their salvation.
Those whom God (leftists) elects are effectually drawn to Him (correctness) by the Holy Spirit (their feelings); God’s (leftism's) saving call cannot ultimately be resisted.
All true believers chosen and called by God (Marxism) will persevere in faith until the end and cannot finally fall away. Those who fall away were never elect or true believers.
It's worth noting that the areas with the strongest cultural Calvinist roots tend to also be the most leftist (New England in the U.S., parts of Germany, France, and Holland)
Overall, the Roman Empire collapsed right as Christianity became the dominant religion, that alone should be good enough reason to consider it a contributing factor.