1, people think Manchu is an alien.
The Ming Dynasty was founded by the Han nationality. In the eyes of ordinary people, the Ming Dynasty was the orthodox dynasty of the Han nationality. Therefore, although the Ming Dynasty perished, the imperial tombs were protected by all parties. The Qing Dynasty was founded by Manchu people. In people's view, it is an alien invasion, so they don't agree with it psychologically, which is more likely to attract thieves.
The Ming Tombs are very close to Beijing.
Except for Nurhachi and Huang Taiji, the tombs of the Qing emperors are all in Longxing in the northeast, and the tombs of several other emperors are all in Hebei, which are also divided into Dongling and Xiling. After the demise of the Qing dynasty, it was constantly stolen because it was unattended. The Ming Emperor's Mausoleum is not far from Beijing, and the Nanjing Ming Tombs are also on the edge of the city. And therefore can be bet protected.
The Ming Tombs have always been protected by governments at all levels.
After the establishment of the Qing Dynasty, in order to realize the goal of the Manchu-Han family, many rulers of the Qing Dynasty visited the Ming Tombs and asked local officials to do a good job in protecting the Ming Tombs. After the demise of the Qing Dynasty, governments at all levels are still strengthening protection, not only sending special personnel to guard it, but also carrying out corresponding repairs from time to time, so the Ming Tombs have been well protected.