Grumbler: ARE shown

are shown - sounds to me like показаны (уже), напечатаны.

показываются - вообще, раз за разом, repeatedly. Например, каждый раз новый набор дат, и каждый раз вразнобой.
Как это передать по-английски?

Все же через ARE. There are those who would use GET in this sentence, but it sounds extremely uneducated.

Uly, could you take a look here:
https://www.lingvolive.com/en-us/community/posts/1123968

I would say “Now notorious, their names have come to signify any crime of passion.“

Thank you! I reread the Russian sentence and I see I can't get what криминальная деятельнoсть влюбленных means. "crime of passion" - преступление по страсти but it's different.

Татьяна, ну это же Bonnie and Clyde
https://en.wikipedia.org/wiki/Bonnie_and_Clyde
https://en.wikipedia.org/wiki/Bonnie_and_Clyde_(film)

Grumbler, it can mean показаны (уже) or показывают, depending on the situation. But in a passive context, GET is kind of extreme: he got shot, she got tattooed, I got caught cheating, etc.