A rough idea of how bad this could have been can be gleaned from taking the situation in New York State, which, per head, is the worst-hit major region in the world so far by official death toll. A quick, and admittedly oversimplistic, comparison suggests that if Covid played out in the UK as it has done in New York, we'd already be looking at around 90,000 Covid-related deaths, or between three times more than we've seen so far -- and, I should add, this wouldn't even have been the end of it.
Covid-19 is not world-ending but it is quite simply worse than the flu on any objective measure. It may not affect your decision to advocate a more rapid re-opening, but if you are going to take a risk assessment then you have to be more honest about the risk. The flu this is not.