Yes. Those people would. However, were you to do a careful analysis of all the people out there murdering their parents, I would be willing to bet that the proportion identifying as atheist would be vanishingly small.
Is this really the way you perceive us as thinking?
Of course not. But the fact remains you guys are borrowing from Christianity by not doing it.
Some people certainly care all about money and would kill their parents for it. This is based on the "money is everything" mentality. There is no objective reason for an atheist to get mad if someone does it. The best they can say is, "Well, you have a different view than I do."
Only Christianity teaches us to love one another. Atheism teaches us nothing. Every man for himself.