I'm not sure what you mean by "the random capitalization of words."  If you actually mean capitalization of whole "words", the very rare times I'd do that would be for extreme emphasis.   For example, in my comment on the Native American dancing, I capitalized MOHAWK KALAPUYA" because the article had incorrectly claimed there were not any "Mohawk" Indians locally.  (We don't know the true name of that  Marcola-area band, but  whites  officially named  them "Mohawk" after the local "Mohawk River" named  for the Eastern Mohawk People.)
 In any case, any capitalization of the first letter of a word would not be "random", but  be because it represents a proper noun,, or again, there is a need for emphasis.  As my laptop doesn't allow for variations in  lettering, such as italics, there is no other way to indicate significance..  I don't know if this is a "conservative" or "American" practice.
Or maybe sometimes I capitalize because I'm careless, lazy or goofy when I dash off a comment.