"We Made a Mistake": The Bad Hire Your Cofounder Won't Fire

You both interviewed the candidate. You both said yes. Four months later the hire isn't working, everyone knows it, and the team routes around them. You bring it up and your cofounder says "give them more time." But more time is not a management strategy. It is avoidance wearing a compassionate mask. Your cofounder does not really want to give them more time. They want to avoid being the person who admits the decision was wrong, because firing someone you chose means your judgment failed, and admitting that out loud, to your partner, in a company where judgment is your primary product, feels like something you don't recover from.
So the bad hire stays, and the team watches, and what the team learns is that performance matters less than politics and that the founders will tolerate mediocrity as long as neither of them has to say it out loud. The hire is not the problem anymore. The inability to act together on an obvious mistake is the problem, and every week you wait teaches the company that obvious mistakes are negotiable.
The trait is avoidance protecting the ego
Two things are running here. "Give them more time" is a low-Assertiveness move, deferring a hard action rather than taking it, and underneath it sits self-consciousness, the discomfort of admitting a public mistake to the one person whose respect you most want. The compassion is real but it is also cover, because the person being protected is not the hire, it is your cofounder's image of their own judgment. The self-sabotage breakdown covers how ego protection quietly produces decisions that hurt the thing you're trying to protect.
The move is to separate the decision from the verdict on your judgment: a hire not working out four months in is normal, and reversing it is competence, not failure. Agree with your cofounder that admitting a wrong call is part of the job, not an indictment of it, and set a clear performance date so the decision gets made on a timeline instead of on whoever can tolerate the discomfort longest.
Where your cofounder sits on the Assertiveness and Self-Consciousness facets behind "give them more time" is measured by the 30-facet OCEAN personality test in about 15 minutes, with domain results free. If an obvious mistake is going unfixed, seeing both profiles shows whose ego the delay is protecting, the same read our role-profiling for teams gives on who avoids the hard call.