He also said the U.S. invasion of Iraq was "a strategic mistake," given the rise of ISIS in the country. "We definitely put fuel on a fire," he said, adding that "history will not be kind to the decisions that were made certainly in 2003."
"It would be foolish for us to wait until [violent Islamists pose an
existential threat before taking decisive action," he wrote, adding, "we
must engage the violent Islamists wherever they are, drive them from
their safe havens and kill them."
How do I know? I'm absolutely certain that he hasn't taken the position here that you seem to project on his words.
He wasn't questioning the invasion of Iraq, so your assertion that his statements on drones not being a sound strategy isn't evidence that he thinks we "need an end to these armed invasions". His statements regarding ISIS most certainly mean that he wants incursions of troops into Iraq, rather than ending armed invasions.
Thus, his words are of zero "utility" toward any good end, and specifically toward ending "these armed invasions".