Correlation does not imply causation, but that doesn't mean that it can't be causation.
Correlation does not imply causation, but that doesn't mean that it can't be causation.
If you eliminate all reasonable additional factors (by controlling variables), you can demonstrate causation. Arguing that there can be unknowable external factors behind everything is not very scientific.
Identifying causal relationships involving humans is difficult due to the excessively multivariate nature of all our interactions, and by extension how difficult it is to "control" humans (as opposed to water, or a wheel). That does not mean it is impossible to ever demonstrate causation.
[1] https://plato-philosophy.org/wp-content/uploads/2016/07/The-...
This sentence is incoherent unless one assumes the denial of causation is bunk, since it makes no sense to attribute either Monadology in general or the specific claims from it being discussed to Leibniz unless he caused the existence of the work, which clearly he cannot have if there is no causation.