Yes, the upstart-queen is from within the bee’s own hive. The hive permits only 1 queen and others are destroyed. The selfishness is not on the part of the worker who kills it, it’s on the upstart-queen who is trying to replace the main queen.
Ah, OK. I'm assuming at some point the upstart-queen does take over the existing hive, maybe once the existing queen dies from sickness or age or the upstart-queen escapes or moves somewhere else to start its own hive?
Yes, apoptosis is selfless. Cancer is the selfishness it fights against: a group of cells in selfish rebellion against the body.
I agree with this. Though, it's a bit odd talking about 'selfishness' in the context of body cells, which I think most people don't think are sentient. But I think we both understand the gist of what we're talking about.