Because its backwards.

The STEEM is still there in all servers running HF-22

And, if those steemians still wanted that steem, they could go run servers to support HF-22
However the servers who mean anything are all running HF-23

So, there is three blockchains. STEEM (old), STEEM (justin), HIVE

So, the same thing that HIVE did, fork the chain and start their own servers
is what Justin did, fork the chain and start his own servers.

The only thing confusing is that Justin kept the name "STEEM"
So, everyone is confused that STEEM(old) had steem in those accounts, and STEEM(justin) doesn't, so it was a theft.

What is more appropriate to say is that the STEEM you knew is now DEAD!