Libs: Is the fact that Reagan was busy defeating the USSR enough to justify his spending?

I always hear from libs "Why do you care about Obamas spending so much, but don't care about how much Ronald Reagan spent". But I thought Ronald Reagan was busy dismantling one of the greatest threats america has ever faced which had the largest army and second largest economy in the world? Not even mentioning it was a totalitarian dictatorship. I guess i was dreaming. Has Obama ever faced a threat that large? And even so Obama plans to increase the debt 4 times what Reagan did!!!!! And that's adjusted to inflation.