You'd believe based on what? US doesn't do any on-the-ground post airstrike investigations most of the time, talking to the affected people. So it can't even know what is collateral damage and what is not.
Really, I'd like to see how would a feedback loop that would make US military minimize civcas work in the real world with the current way these things are evaluated by the military.
US had for a long time literaly two people dedicated to processing the hunderds of their civilian casualty incidents reports until recently. They have backlog of a year or so of reports. So after killing thousands of people in Raqqa and leveling the City, US military hasn't even started processing complaints. The operation is over for 5 months and official casualty numbers are like "perhaps we might have killed 2 civilians". "Sorry we have backlog." Meanwhile, hunderd corpses are still being extracted monthly from the leveled buildings in the city months later.
Still, it's mildly better than the idiotic european allies who still maintain that they killed no civilian after droping thousands of ~200kg bombs since 2014. It's really that demented.
It may be a stated goal to minimize collateral damage. But with this crap going on, I don't believe it has any meaning. US military probably employs 100x more people to clean the fucking toilets than to process the civcas reports. Lip service and all.