It's like a 50/50 of people being stupid versus Kirsh deliberately setting up things to fail according to whatever plan he has.Kirsh was very close to losing everything too. If Arthur had lasted a bit longer, Morrow would e taken him, the xenomorph, and 2 hybrids and left. Kirsh only succeeded because they had to go to plan B and advance to the lab. It really like pure luck that things worked out in his favor.