[Umihito]

In my opinion, if someone really wouldn't kill someone, they wouldn't. And no TV show would convince them otherwise.
If they have it in them to do it, and have the capacity to actually carry it out, a TV show wont push them to it. If they really want to do it, they will.

Intelligent peple usually calculate the murder well in advance to get away with it, and so may well not need the show to come up with plans.

I mean, it takes 5 minutes to put a list of all the things that could get you, and then figure something to counter it, especially if it's an anonymous murder. I mean, forensics...

Hair - wear something that covers it all, and get a collection of hair from a salon discretely, spread it all around the scene
Fingerprints - layers of gloves from long ago so no sales records can be tracked
Blood - ... Well just try your hardest not to bleed
Sperm - Just don't do the deed lol
Car - Make a spinning numberplate so you can change it when need be, and spin it back up in the countryside

Plus masks and such to cover your identity from cameras.

I mean, I came up with this list in 5 minutes, and I think it's pretty solid.
The days of detectives like on the show 'Monk' are pretty dead. Forensics are king these days. And if you're not connected to the victim a detective would find things hard to piece together anyway.

So I think these shows generally don't drive people to do things, or the entire audience, and most of America and every country it shows in would be murder crazy.