Yep, our defense problems today are imagined. Our border and port security are as tight as drums. No trade concerns at all, either. We don't have a lopsided legal arrangement with most countries that purport to fairly trade with us--they're just single pages of paper which say "you trade with us, no tariffs allowed, we trade with you, no tariffs allowed." Oh, it's nice to post to someone who's part of the real world, instead of imagining things. /sarc
The imagined part is the severity of problem, not whether the problem exist at all. A country the size of the U.S., there is no problem that doesn't exist on some level, the debate is always about the severity of each and which should be given priority.