Ask HN: What the hell libpcre1 is ?( a horror story for sysadmins )

demo video : https://youtu.be/AnwAl25MxMU

I tried to remove libcpre1 on SLES 12SP1 and install again to downgrade. We are using cluster management software which automatically send yes to all zypper commands. After hitting enter on cluster management system it deleted about 700 packages in a few seconds and we lost tools from ssh to rpm which is crucial to reinstall lost packages. We can only access system via console connection. The only option is left to reinstall from yesterday backup but I wonder why this package remove all software on the system