Nearly 80% of Britons think the £9 billion spent on the Olympic Games was value for money.
A new poll by Guardian/ICM shows that 78% of voters believed the Olympics "did a valuable job in cheering up a country in hard times", compared with just 20% who looked back on them as "a costly and dangerous distraction".
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The man, in his thirties, was found with stab injuries on the upper deck of a bus in Handsworth, Birmingham, on Monday night.
Thousands of passengers now face delays, with Southeastern trains warning "all services" would be affected.
Paramedics attended a scene in Willesden, north-west London, on Monday afternoon where they found the teenager with stab wounds.