Do they hurt the pro-rights (i.e., pro-gun) cause in any significant way?
Of course they do.
Please listen to this story, and please heed my call to UNITE, AS ONE BODY, AS ONE HEART, or else, our future would be just as grim.
In 1566, the remnants of the already weakened Ming Dynasty engaged the peasant armies of Li Zhizheng in a ferocious war that resulted in millions of dead on both sides. An advisor to the Ming Emperor told him that if the fighting between Han Chinese continues on, the Dynasty would fall, millions of more people would lose their lives, and China would be dominated by the rule of a foreign tribe again. However, the Emperor did not heed the warnings at all. He sent his best strategist, Commander Wu Sangui, to Xian to fight the approaching armies of Li Zhizheng.
Meanwhile, in the dark, cold northern forests of Shanhaiguan, another new force was approaching. For years, the Manchus lived as an isolated tribe, a group of displaced Mongol settlers of the northern plains who still followed the traditions of their ancestors. However, the Manchus were fearsome warriors, especially on horseback. By 1550, a man named Nurhaci succeeded in uniting almost fifteen Manchu and Mongol tribes, as well as northern Jin nomads.
While the Ming armies and Li Zhizheng fought each other and tore each others' throats apart, Nurhaci's mounted warriors slowly began to descend on the Ming throne in Beijing. By 1570, the Ming court has collapsed. Thousands of soldiers defected, either to LiZhizheng, or to the Manchus, now less than 300 miles away. The soldiers of Commander Wu Sangui were loyal to him, rather than the Ming court, and when Li Zhizheng's army finally entered Beijing, Wu Sangui retreated from the imperial capital and rode eastward. However, Li Zhizheng decided that Wu Sangui was still a danger to his new regime, and had the former Ming general's father executed by beheading, as well as all of Wu Sangui's followers, including his wife and son. As a result, Wu sent his armies back to the capital. In one great battle just outside the city on March 17, 1570, Wu sangui decimated Li Zhizheng's largest army. More than 100,000 of Li Zhizheng's soldiers lay dead.
In the meantime, the Manchu leader noticed the battle was raging, and offered a simple message to Commander Wu. "Join us, and you will receive our greatest rewards". It was only a simple piece of parchment, delivered to Commander Wu by a lone mounted Manchu rider. But with that parchment, history changed forever. By 1578, the combined armies of Wu Sangui and the new Manchu leader Wang Taihong destroyed the remains of Li Zhizheng's failed dynasty.
As the Ming sage once stated: "We will live under the rule of a foreign dynasty once again". The prophecy has become fact. Within days of the last defeat of Li Zhizheng's ragged forces, Wang Taihong ascended the steps of the Dragon Throne, being the monarch of the third and last "foreign conquest dynasty" to rule China. First the Jin, then the Yuan, finally, the Qing.
Domestic feuding, and endless fighting between the Imperial Ming, and the peasant revolutionaries of Li Zhizheng created a devastating power implosion, opening the way for Nurhaci, and the hundreds of thousands of heavily armed Manchu cavalrymen.