Those things are engineered to be air and water tight for shipping. They have small vents to let excessive heat build up escape but they need more air flow for humans to be able to live in them, and in most residential/housing configurations, HVAC needs to be considered. Reflective colors help a little too, so we try to keep that in mind, but sometimes the customer just has to have black or dark blue, which can be deadly in certain extreme heat situations without proper venting/cooling. They weren't engineered for humans to live in them as-built, so we use them as a base structure to mold into something inhabitable.
If they're just throwing people in connex's with no modifications, then yeah, that's quite inhumane. That picture is very misleading in that scenario.
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