Sure, but all plot contrivances are not created equal. People don't itch unless it serves the purpose of the plot, but that's because it's something so mundane that unless it has a point, no one wants to see.
The therapy issue is more along the lines of fiction not evolving with the times. There are settings in which no therapists being around makes sense, as this is a relatively new soft science. However, in more modern settings, the lack of a therapist is a problem depending on how socialized your characters are, because therapy works
. However, this trope is all about how the presence of a therapist is conspicuous.
For example, a serial killer like John Doe
might not see a therapist because he doesn't want to. But Black Snake Moan
involves a man single-handedly trying to fix a nymphomaniac and her equally-screwed-up fiance by chaining her in his house. That
is something worthy of note, because it's consistent with the trope as it's portrayed.