It wasn't a naive belief, people did choose to get along economically and everyone benefited. The naive part is thinking that economic interdependence means political submission and that political and economic development are necessarily related.
Sure. As I pointed out, something like the CHIPS Act may be good for US resilience and national security, but is unlikely to be good for US economic output.
Aka giving up the security and being more vulnerable to volatility. The pendulum can swing too far, as resilience cannot be measured in dollars.