@futurebird @AnarchoNinaAnalyzes
The Nazis didn't do that even after they'd built their death camps, for two reasons.
First, shooting people isn't actually that cheap. You still need to dispose of the bodies. Killing a load of people in the same place makes it easier put them in mass graves.
Second, if you shoot people in the streets then, as you say, the optics are bad, but that matters for two reasons. People will be more likely to resist if they know that the alternative is death, and people are more likely to help people they know will die without help. If you keep up the fiction that they're 'just' being relocated, you can persuade a large portion of the population to not help them and convince them that resisting to the point of being shot is not worth it.
If you want to systematically exterminate people, letting them know that's what you're doing makes it harder, and having to do it where they are is expensive. Some of this has probably changed since the 1930s, because efficiency is no longer a priority for the folks who are trying to extract as much money from the government as possible without the constraints of basic ethical behaviour.
But my point is not that this isn't a concentration camp, it's that calling it one is historically accurate but in a way that can cause confusion due to over 80 years of intentionally ambiguous terminology. The good guys have internment camps, the bad guys have concentration camps.