From the link you provided.
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Origins of the War
The immediate origins of the war were seizure of American ships, insults and injuries to American seamen by the British Navy, and rapid expansion of the American frontier. The British outrages at sea took two distinct forms. One was the seizure and forced sale of merchant ships and their cargoes for allegedly violating the British blockade of Europe. Although France had declared a counterblockade of the British Isles and had seized American ships, England was the chief offender because its Navy had greater command of the seas. The second, more insulting, type of outrage was the capture of men from American vessels for forced service in the Royal Navy. The pretext for impressment was the search for deserters, who, the British claimed, had taken employment on American vessels.
The reaction in the United States to impressment differed from that aroused by the seizure of ships and cargoes. In the latter case the maritime interests of the eastern seaboard protested vigorously and demanded naval protection, but rather than risk having their highly profitable trade cut off by war with England they were willing to take an occasional loss of cargo. Impressment, on the other hand, presented no such financial hardship to the shipowners, whatever the consequences for the unfortunate seamen, and the maritime interests tended to minimize it.
To the country at large the seizure of American seamen was much more serious than the loss of a few hogsheads of flour or molasses. When a British naval vessel in June 1807 attacked and disabled the USS Chesapeake and impressed several members of the crew, a general wave of indignation rose in
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which even the maritime interests joined. This was an insult to the flag, and had Jefferson chosen to go to war with England he would have had considerable support. Instead he decided to clamp an embargo on American trade. In New England scores of prosperous shipowners were ruined, and a number of thriving little seaports suffered an economic depression from which few recovered. While the rest of the country remembered the Chesapeake affair and stored up resentment against Britain, maritime New England directed its anger at Jefferson and his party.
Which explains this
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New England opposed the war and refused to provide troops or financing. Financial and logistical problems plagued the American war effort.
Many powerful actors in New England opposed war, not for any questions of morality but for purely selfish reasons. It cut into their profit margin.
Human Rights were a major factor in the motivation for an armed confrontation, and continued to be so throughout the conflict.
In one incident 23 American troopers were separated from their fellows after being captured by the British and sent to England to be tried and executed for Treason because they were born in Ireland.
American Commanders made it known that if these men were executed a like number of British POWs might share their fate, the Irish-Americans were released except for one who'd died in the British prison.
As for how the Man on the Street of Britain saw the war.
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The motive that controlled British policy was plainly revealed in an editorial article which appeared in the London Independent Whig (January 10th, 1813), after the war had been begun and the British public had been astounded by the capture of two or three of their finest frigates. "Accustomed, as we have hitherto been, to a long and uninterrupted tide of success upon the watery element, and claiming an absolute and exclusive sovereignty over the ocean, to be defeated there, where we securely rested our proudest hopes and wishes, might reasonably be expected to check our insolence and mortify our pride. In this view of the case, and if we could not flatter ourselves that it would have the effect of inducing us to abate somewhat of our unwarrantable pretensions, and listen to terms of moderation and forbearance, our regret would be sensibly diminished; since even the misfortune, severe as it is, might be converted into a great and lasting benefit to the nation at large. But the mischief will not confine itself here; the charm of the invincibility of the British navy, like that of the Grecian warrior, being destroyed, the terror that has long preceded our flag, and commanded the abject homage of surrounding nations, will henceforward be dissipated, and every maritime power with whom we may be involved in war will fight with redoubled zeal, ardently and anxiously hoping to lower our ascendancy and establish the freedom of the seas.'' That was it exactly; they were afraid somebody would establish the freedom of the seas, and at that time the Americans seemed most likely to do it.
http://www.thetroubleshooters.com/comet/1812war001.html