I don't think anyone disputes that companies are doing this as a precaution nor that it's common practice. It's "understandable" in that we've become conditioned to expect corporations to ignore ethics or morals in service of their bottom line ("What do you expect them to do? They have a 'fiduciary responsibility' to their shareholders!"). In general, I think it's absurd to claim all employees' work just to protect against niche cases, and I would like to see this practice (and similar practices) outlawed.