"The virus is far too efficient,"
Actually it isn't - it currently has only infected 270,000 people in the Uk in over 4 months - 4% of the population - and its only killed 1 in 1700 of the population - and 90% of them are over 60 and already sick. One reason biological weapons are more widely used is exactly this issue - they are unpredictable and slow. The real damage to the world is the lock down - but that is voluntary and could be reversed immediately if a "hot" war broke out