I can understand how it happens. People have to move in a hurry, or maybe they got evicted. For whatever reason, they decide not to move their stuff and throw it in the dumpster instead.
Towards the beginning of every month, I see dumpsters filled with furniture and household items. Those items won’t be recycled or re-used, they will end up in a landfill.
It costs money to move. Stuff costs money. Having space for stuff costs money.
There are many, many organizations that accept used household items. Some organizations will even come and pick up your reusable furniture. I have occasionally pulled furniture from the alley behind my house and donated it to the local thrift shop.
There has to be a better way. A more environmentally friendly way and a way to get these household items back to their owners or get them in the hands of someone who can use them.