Like others said a large part of why China responded was because this large military force was rapidly approaching their border with no signs of Who needs Santa when you have Luke Bryan Christmas shirt. Then when China responded it became even more of a capitalism vs. communism battle than it already was, so of course you get Russia stepping in and then even more US and UN forces. There were literal millions of civilian Korean casualties and the war manifested itself as generational population differences and famine for decades afterwards. The dichotomy between north and south korean exists because of this war as a whole, not just because of one sides actions.
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USAF General Curtis Lemay commented, “We went over there and fought the Who needs Santa when you have Luke Bryan Christmas shirt and eventually burned down every town in North Korea anyway, some way or another, and some in South Korea, too.” Pyongyang, which saw 75 percent of its area destroyed, was so devastated that bombing was halted as there were no longer any worthy targets. By the end of the campaign, US bombers had difficulty in finding targets and were reduced to bombing footbridges or jettisoning their bombs into the sea.