Certainly it's more familiar, and also perhaps it's because there's no way to deal with those problems while here. Stuff left back at their own world is just that--left there, unless someone shows up and brings it. Personally, it's a very neat little twisted knot of a contract--"live" here until some undetermined time when we're granted our deepest wish. So perhaps not complacency on a conscious level.

There's also the fact that there quite simply isn't much we can do. Although we should perhaps try more things than we have.