What do jalapeños, fajitas, Majorca and Juventus have in common?

I was in Subway getting a sandwich the other day, and someone in front of me in the queue was asked if he wanted any jalapenos on his sandwich.  Oh "ja-lapenos" (he said stressing the J at the start of the word so that it was pronounced the same way as in 'jam'). 

The girl behind the counter said "yes, jalapenos" (pronouncing the word correctly), whilst rolling her eyes.

I heard someone order fajitas as well not so long ago, again insisting that the 'j' should be pronounced as in jam.

They must hear people pronounce these words correctly, and then choose to ignore the correct pronunciation.  Surely no one says Majorca with a hard 'j' anymore, although it wouldn't surprise me?

Andy Gray often refers to Juventus with a hard 'j', and he's not the only one.  Kevin Keegan does exactly the same.  Again they must hear people pronounce Juve or Juventus correctly and choose to ignore that they are the ones who are wrong?

The same people who insist on the hard 'j' incorrectly, also seem to be the same ones who insist on calling José Mourinho - 'Hosé' as it would be pronounced in Spansh, but not in Portuguese.  Do they take delight in getting it wrong and making themselves sound less intelligent?  Is it something they work hard at?

Talking of 'pronunciation' I am hearing more and more people mispronounce it so that it sounds like pronounce-iation. It isn't even spelt like that, so why do they insist on mangling the English language so?