It's degrading when you don’t hear back after an interview. I’ve observed and personally experienced the frustration and ill effect when a potential employer does not follow up when they said they will. If you haven't experienced it, it’s similar to how Aziz Ansari says it is when you've been texting with a girl and she doesn't text you back.
Let’s change the tide and quit devaluing interviewees by failing to follow up with them.
And so -
1. They’re humans.
Treat them with the respect you would like - if it was you, you would want to know. The golden rule is called such for a reason. If you don't follow up with them, it's like you're saying they're not even worth a phone call to let them know. They are worth it, so please do it.
2. You could regret it if you don’t.
Even if you don’t want them for a position now, you may in the future. Burn that bridge and you may regret it if they don’t answer when you come knocking later.
3. You can shed your fear of delivering bad news.
Obviously you’re avoiding it because you’re delivering rejection, but getting over this fear, instead of giving into it, will make you better. Promise.
4. You may garner more respect for your business.
I went on a series of interviews at a non-profit a few years ago and eventually did not get the job. They called on the day they said they would and politely informed me that they were going with someone else. I was sad to be rejected but respected them and their decision because they created an expectation and followed through on it. I didn’t grow bitter as I may have if they didn’t follow up with me when they said they would.
I know you’re not doing this - lying to people by telling them you’ll get back to them but never following through. This is just encouragement for you to continue to change the norm of business by following up with rejected interviewees. After all, they’re people too.