As a cyclist you may have less than one second to avoid an opening car door. You can't always give a wide berth because bike lanes in the US are usually very narrow.
That doesn't mean you can't give wide berth. Take the lane if the bike lane puts you too close to car doors. If there's one thing I've learned from biking in US cities, it is to never trust bike lanes to be safe.
You can't give wide berth because most bike lanes in the US don't have enough space.
And let's face it: would you rather risk getting hit by someone opening their car door, or getting clipped by a vehicle moving at 40 mph plus?