There are just a large number of people who like that genre in general. A ton of the juggernaut TV shows are in the law/fire/med drama genre. It's been that way for decades. In the case of NCIS, it's been so long that people are just invested in it. You think 20 years is wild? Think about the soaps. Y&R has been running with the same characters since the 60s or something. People have watched their entire lives. Insane.
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