I was too young for the great ticket burnings of the 70's but that wouldn't surpise me. Though it should be said that NY doesn't riot when its teams win a championship.
The Giants were such a disgraceful team in the 1970s (maily due to the long-running feud between Wellington Mara and his nephew Tim) that Pete Rozelle sat them both down in 1979 and told them that he would force them to sell the team (as commissioner he had this authority) unless they became competitive in a hurry.
The big problem with the team was that neither Wellington nor Tim could agree on a general manager. They hated each other so much that any candidate who was proposed by one was automatically rejected by the other.
Rozelle told them each to submit a list of names of all the general manager candidates they had considered, and he told them that he would select a GM who was not on either list. He picked an old friend of his named George Young.
And the rest, as they say, is history.