One of the innovations of ISS is larger docking adapter with bulkhead that is removed after docking. Russian section still uses hatches. All of the cables go through the docking adapter or hatch which makes impossible to close door or quickly disconnect.
Love the use of the word supposed there.
Dragon is built by Space X that has a track record of blowing things up.
Maybe parent feels like rocket science is a field that should have few launch failures?
I can't give you a quantitative answer since I'm usually focused on new research rather than what company/nation did said research... but their stuff does seem to blow up on the launchpad more often than NASA's :-)
Unless you count test artifacts, an actual catastrophic failure of a rocket on a launchpad (or even in flight) has been rare in the last 10 years.
I.e. leaving the actual ISS structure entirely.
Not exactly something you want to be doing under time pressure.
https://en.wikipedia.org/wiki/Salyut_3
had a machine gun!
There are not. The airlocks on the ISS are either docking modules for spacecraft, for spacewalks, or for deploying satellites.
The crew shelters in the vehicles so that in case of an emergency they can evacuate immediately.