Are two wires coming out of the same circuit breaker safe?
It depends -- some circuit breakers are designed to accommodate two wires. If they are, though, it'll be clear that they are. For example, these Square D Homeline breakers are marked with symbols or text indicating that two conductors are allowed but only if they're both copper. The plate under the screw and the molding of the case are also visibly formed to accept two conductors.

Your breakers could be marked on the side of the case; you'd likely have to remove one to find out. There's a label just barely visible which might tell the story.. I'm not well-acquainted with your BR breakers but to my eye they don't look like they're designed for two conductors.
In any case, it's always safe and easy to use a pigtail: a single piece of wire as a jumper between the breaker terminal and the other two wires. Join the pigtail to the others with a twist-on or push-on wire connector.