This is one key issue on which proponents of ID and of theistic evolution differ.
The Drake equation is simply the product of a set of factors, estimating the number of active, technologically advanced, communicating civilizations in our galaxy.
If life in the universe is singular, if we’re it and there is no other life, whether intelligent or otherwise, what’s the bad news about that, and what’s the good news?
Never fear: whatever our purely hypothetical response to a purely hypothetical event, it can be reconciled with evolution.
Here’s a case where astronomers ruled out intelligent causes, despite their initial excited hopes.