I personally think there are two ways to think about this.

Of course everyone Always thinks before they speak--we're all thinking machines--we think All of the time. I think what you mean is someone should suppress speaking what they think in a situation where we're thinking hurtful things. Probably we shouldn't say them, but why are we thinking hurtful things? Of course I know the adage 'if you can't say something nice, don't say anything at all'. It's not the words that are hurtful, it's the thought they represent.

The other way to think about this is more the one I agree with. If you say what you think--tactfully, as constructive criticsm, you may actually improve things. If you tell your sister that the chicken she's served you is still raw, she may sneer at you, but you can put it back on the grill and she'll pay more attention next time. If you tell your daughter that the top she's wearing is too revealing, she'll be mad as she goes to change it, but she won't try that one again. My point is, telling the truth can solve problems. Holding it back can make them worse.

Of course, 'winning' an argument always makes you look bad, so I agree that people should never continue to argue. If you've made your point, then shut up. If your sister doesn't want to put your raw chicken back on the grill, then just be quiet and eat it.

From an engineering point of view, does this buzzer analyze their thoughts or does it just act as a delay for every spoken sentence?--because some delay to analyze how to say something in a non-confrontational manner is useful. But not for 'please pass the carrots'.

As a general point, considering the miseries humanity inflicts upon itself for unrewarding behavior, a buzzer that would encourage thinking in general would be most welcome. Just how this can be managed probably requires some sort of buzzer as a stimulant.

Yes words can be hurtful, yes they can result in many harsh realities that we have succumb ourselves to, but they also can result in the beauties that we hold so near and dear. Having an object like this would take away from the spice that confides itself in our daily conversations, and can deter someone from making a suggestion and severely hinder our creative side.

Take this very topic for example, if you had something that disrupted your concentration and motive, do you really think you would have posted this?