The key to most magic tricks is to distract the audience's attention from what you're actually doing, getting them to look at something, anything, else other than how the trick is done.
Other forms of live entertainment such as theatre and even music make use of the same concept. Intentionally focusing the audience's attention not so much because they want them to be looking at whatever they're focused on, but simply to avoid the audience looking at something else.
Now if a magician, actor or a musician does that then OK, fair enough, I'm there to see the show and the deception isn't doing any harm. All good, I get it, they don't want the audience to know where the rabbit came from or to pay attention to the fact there's nobody actually playing a triangle and that bit's recorded.
When politicians use that trick however it's far more concerning.