rm -rf /run/dbus/dbus.pid command run remove pid file only if user is situated in /run/dbus folder

[JanuszChmiel]

Dear Proot developers,
I have observed very interesting behaviour.
When I want to remove The pid file from The /run/dbus folder
by typing
rm -rf /run/dbus/dbus.pid
there is no error message but file is never being really deleted from The /run/dbus folder.
It is really only deleted, if I really type
cd /run/dbus
or by typing
cd run
cd dbus
Why Linux behaves by this way?

I Am starting The mate desktop environment by typing
rm -rf /run/dbus/dbus.pid
dbus-daemon --system
dbus-launch mate-session&

Do you think, that it does make any good sense to start dbus by typing
dbus-daemon --system
for such desktop environments such as Mate are?
Or do you think that I Am only wasting my time?