Sure, but I mean, often you can’t solve the “systemic problem” so the next best thing is to at least try to work on yourself. Necessary but not sufficient I guess. But cruel?
TFA just points out that the opposite tack (It's all society's fault so I'm screwed no matter what I do), is also not helpful. Also (IMO; not sure if author of TFA would agree with me) the "lazy pessimism" is at least partly a push-back against "cruel optimism." If the optimism were paired with more empathy, then lazy pessimism wouldn't be the obvious alternative.