I believe it's likely that lockdowns may cause some deaths, or possibly even lots of deaths. However, they certainly help prevent the spread of deadly disease too and hence prevent many deaths. We can probably get fairly definite numbers on how many deaths lockdown prevents in a large population. I don't think we can get similar numbers on how many they cause. My gut says they probably prevent a lot more than they cause, but I'd like to see any studies on this, if anyone has a link to share.