tell me why

a chevy guy owning a mopar REALLY makes no sense

No, it makes perfect sense.... I'm one of those guys & I can tell you EXACTLY why I do it......... cost & conveinience.
Mopar, from an engineering standpoint, to me is a great car. BUT there's relatively little, AFFORDABLE support for 'em & it does take more brains to make 'em run. Chveys are a dime a dozen, tons of parts & every swinging you-know-what can make 'em run or knows how to fix a problem you'll have with them.
Not so Mopar------ most mopar-ites are either the white-glove/concourse types or they have enough money to buy trick head, valve gear,etc. to make 'em run & in their mind it's "top secret":mad: stuff that if (in their "expert opinion") you're not serious enough for them, they'll blow you off.
All that said, I still prefer Mopars, having been "converted" to them, but I like all cars. The OPs question is very valid& besides my response, I think he got some very valid responses to aquestion any new Mopar-ite would have after working with a different brand for some time....