Even with the front tires dangling in the air there is so much torsional load on the bars they will not come out. Think of the spring rate. Can you bench press the lower control arm while the t-bar is installed? All that pressure is mashing the hex ends into the sockets. You will not push them out.
I've seen some cars that were in very serious collisions that didn't push the t-bars back.

It's simply a non-issue.