“Once lead this people into war and they will forget there ever was such a thing as tolerance.”
Conversation with Frank Irving Cobb before asking Congress to declare war (2 April 1917). Attributed in Cobb of "The World," a leader of liberalism, by Cobb and Heaton, 1924, p. 270 http://books.google.com/books?id=Vxt5W3LrvSYC&pg=PA270&dq=%22Once+lead+this+people%22
1910s
Help us to complete the source, original and additional information
Woodrow Wilson 156
American politician, 28th president of the United States (i… 1856–1924Related quotes

“To tolerate does not mean to forget that what we tolerate does not deserve anything more.”
Sucesivos Escolios a un Texto Implícito (1992)

“Heaven forgets, or tolerates—waiting for you to reform.”
Balsamo the Magician (or The Memoirs of a Physician) by Alex. Dumas (1891)

Vol. 1, Notes to the Chapters: Ch. 7, Note 4
The Open Society and Its Enemies (1945)
Context: The so-called paradox of freedom is the argument that freedom in the sense of absence of any constraining control must lead to very great restraint, since it makes the bully free to enslave the meek. The idea is, in a slightly different form, and with very different tendency, clearly expressed in Plato.
Less well known is the paradox of tolerance: Unlimited tolerance must lead to the disappearance of tolerance. If we extend unlimited tolerance even to those who are intolerant, if we are not prepared to defend a tolerant society against the onslaught of the intolerant, then the tolerant will be destroyed, and tolerance with them. — In this formulation, I do not imply, for instance, that we should always suppress the utterance of intolerant philosophies; as long as we can counter them by rational argument and keep them in check by public opinion, suppression would certainly be unwise. But we should claim the right to suppress them if necessary even by force; for it may easily turn out that they are not prepared to meet us on the level of rational argument, but begin by denouncing all argument; they may forbid their followers to listen to rational argument, because it is deceptive, and teach them to answer arguments by the use of their fists or pistols. We should therefore claim, in the name of tolerance, the right not to tolerate the intolerant. We should claim that any movement preaching intolerance places itself outside the law, and we should consider incitement to intolerance and persecution as criminal, in the same way as we should consider incitement to murder, or to kidnapping, or to the revival of the slave trade, as criminal.

2005
Context: I think the government should be spying on all Arabs, engaging in torture as a televised spectator sport, dropping daisy cutters wantonly throughout the Middle East and sending liberals to Guantanamo.
But if we must engage in a national debate on half-measures: After 9-11, any president who was not spying on people calling phone numbers associated with terrorists should be impeached for being an inept commander in chief.
With a huge gaping hole in lower Manhattan, I'm not sure why we have to keep reminding people, but we are at war. (Perhaps it's because of the media blackout on images of the 9-11 attack. We're not allowed to see those because seeing planes plowing into the World Trade Center and the Pentagon might make us feel angry and jingoistic.)
Among the things that war entails are: killing people (sometimes innocent), destroying buildings (sometimes innocent) and spying on people (sometimes innocent).
That is why war is a bad thing. But once a war starts, it is going to be finished one way or another, and I have a preference for it coming out one way rather than the other.