They tried before with commercial launches, and were burnt pretty badly.
If it was important to try it once, it may be important to try it twice, thrice, or as many times as it takes to get it right. Quietly discussing and extensively planning for what needs to happen for a positive outcome can increase the likelyhood of success.
Lots of really big ugly things happened during the Cold War and a whole lot of good people were killed, yet we nonetheless went out and carefully planned and successfully flew the the Apollo Soyuz Test Project
mission in July 1975.
"Apollo Soyuz Goals
Apollo Soyuz was the first international manned spaceflight. It was designed to test the compatibility of rendezvous and docking systems for American and Soviet spacecraft, to open the way for international space rescue as well as future joint manned flights."
"Planning the mission required years of exchanging information and working together to overcome language barriers and the hurdle of two different measuring systems. Russia uses the metric system and Americans use inches and feet."
And, "Those years left a legacy of brotherhood between scientists, pilots and engineers who found that, despite official propaganda, they liked each other, said Leonov."
And, "'Remember that time — the insane mistrust, not just for people, but between countries," said Leonov. "We discovered kind, good, smart people, who decided to show all of humanity that we are completely different."
From: Apollo-Soyuz Mission 25 Years Later
By Claire Moore
"NASA administrator Charles Bolden pointed out that the five partners are reaching out to other non-traditional nations.
'We have encouraged each other to go out and try to find people who would not have an opportunity to enjoy this incredible facility that we have and bring them in as best we can,' he said."
From: Some space station partners appear ready to welcome China into the group
Now do we want to try to "bring them in as best we can" or should we try to start a new Cold War? Do you want to go to the Moon, NEOs, Mars, and Ceres? Do you really want a fully utilized International Space Station? Do you ever worry about the Fermi paradox or wandering NEOs and planets?
The ISS is where some of our common space research and other work can occur and be shown to the world on live high-definition TV and Internet video shows. But the careful and extensive discussions, politics, planning, building, and mission control coordination activities will happen here on Earth.
Welcome to the Spaceship Earth. Be polite to your crewmates. Folks around the world might be watching you.