Because the post you originally responded to was contrasting Tesla's (alleged) treatment of its employees with its save-the-world ethos in order to question the sincerity of the latter.

By adding the "if necessary" bit you turned it into a trolley problem which misses the point entirely.

It uses an extreme example to illustrate how the two are not contradictory. But you're right, I should have just gone straight for pointing out that they're not connected.