Depends on how you view it !!
In terms of the sheer numbers of people affected, and how widespread the consequences of the action have been, you've obviously got a point.
But, how about seeing it this way ? Let's assume that the virus escaping Chinese territory wasn't intentional (& most people would believe that was the case). HOWEVER .. what Sadiq Khan is doing, is very deliberate. He can restore public transport in the Capital to normal or near-normal levels, if he chooses to (he's even had Boris offering him help with that, if he wants it !!).
BUT .. Sadiq Khan refuses to increase availability of travel. Nothing stops him from arranging the increase, and he's had pleas that he does. But Khan just won't do it.
China = accidental viral contamination.
Khan = transport levels kept so low, DELIBERATELY, so as to make crowding impossible to avoid during 'rush hour' travel.
Which is worse ?