No, if the selling of the drugs was a felony it would qualify is my interpretation.
Felony murder applies to: during the commission of a crime that is a felony(a lot of states require it to be a dangerous felony and spell out which ones) or the flight immediately following the commission of said crime
Your CEO hypo doesn't work. The CEO could potentially be charged with other crimes, negligent homicide, reckless homicide, depraved indifference, etc, but not felony murder.
The drugs case/hypo is also a huge stretch. The drug dealers crime is selling the drugs. He is not a co-conspirator to any subsequent crime that drug user commits(drug use/possession). He could however be charged with other crimes, just not felony murder.
In addition, almost every state that has a reasonably foreseeable standard as felony murder is codified and limited these days. See CA, where it was not reasonably foreseeable that during the immediate flight from a robbery that the stolen goods would fall off the robbers truck and kill someone.
However, it is reasonably foreseeable that someone may get killed during a robbery of a home(as in the case of the OP). Sucks the kids are in a state that allows for felony murder liability for the deaths of co-conspirators/participants. Not every state has felony murder, and those that do only around half allow for felony murder liability for the deaths of co-conspirators/participants.