How does Danny feel about Zionism? Why does he not voice his opinion?

Danny did not join any Zionist group because he could not, considering his father. David Malter gives a speech claiming that the slaughter of six million Jews will only have meaning on the day a Jewish state is established. The next day Reuven finds Danny white-faced and grim. He does not talk to Reuven until they go into the bathroom together, where Danny admits that his father had read about David Malter's speech and had forbidden Danny to have any contact with Reuven. If Reb learns of any contact between the two, he will send Danny to an out-of-town yeshiva. Reuven calls Reb a fanatic, but Danny says that the fanaticism of men like his father kept them alive for two thousand years of exile, and if the Jews of Palestine have an ounce of that fanaticism they will soon have a Jewish state.