Crenshaw can't deny his poor choice of words at that moment, but this incident has been blown way out of proportion. He and Carlson have engaged in online disputes for years now, often due to ignorant, slanderous attacks by Tucker against Crenshaw. On the one hand, Crenshaw made a big mistake, but on the other, he's understandably reached a breaking point with Carlson's defamatory comments.
While Crenshaw deserves respect for his military service, that doesn't shield him from criticism, especially regarding death threats against journalists. Carlson represents the growing America First moment, specifically the desire to stop sending heaps of funding to other countries while Americans struggle at home. If Crenshaw truly wanted to represent his constituents, he'd stop taking marching orders from establishment Republicans.