And also, ID isn’t about intelligence in humans but about complex systems requiring intelligence to order them.
ID as a hypothesis may and is applied to explain phenomena beyond the existence of complex systems. Indeed, ID is employed as an alternate hypothesis to the theory of evolution to explain the existence of any biological system, simple or complex.
Both hypotheses appeal to the "causes in operation" principle:
No more causes of natural things should be admitted than are both true and sufficient to explain their phenomena.
True causes are causes known to exist, causes now in operation, as opposed to imagined ones. Sufficient causes are the number required to explain the observed data. The Sufficiency rule also restricts the number of causes eliminating superfluous explanations.
Darwin plead “causes in operation” when he used animal migration behaviors to explain common descent. Darwin, of course, assumed that the “now operational” variations observed in animal breeding could likewise explain macro-evolutionary changes. Darwin did not know DNA.
A cornerstone claim in the ID hypothesis is that we routinely observe intelligent agents as “causes now in operation” that generate the same type of specified information as we find in DNA. Think humans and computers – data bases and executable programs.
The simultaneous presence of this biological information, digital code (DNA) and specified processing information (mRNA) are necessarily present for replication before the first cell can become two. DNA is not enough and mRNA is not enough. Which hypothesis better explains the possibility of the simultaneous existence of both, that is an adequate explanation for the origin of biological information – evolution or a conscious (intelligent) agent?
But this is like when people (atheists and theists) mistakenly claim or strawman that “everything has a cause,” which is an absurd premise and not how theologians actually approach the issue.
The principle of sufficient reason underpins all scientific inquiry. Science that is meaningful has predictive value. Predictive value depends upon examining the effects and understanding their causes.
One of Catholicism better theologians relied on PSR not only as a premise but as his 2nd argument for the existence of God.