"Even if China was malicious and deliberately sent it off to us, it could've been easily stopped but we didn't do it..." Hmmm...if it could "easily" have been

"Even if China was malicious and deliberately sent it off to us, it could've been easily stopped but we didn't do it..." Hmmm...if it could "easily" have been stopped, then why did every single country in Europe and North America simultaneously fail to do so?