Because it is disrespectful to the Sanbao monk. It will arouse the antipathy of some dharma protectors and lead to your bad luck.
Tattooing this pattern has many taboos, such as men and women. Bad thoughts and behaviors may aggravate bad luck. No tattoo is on the top.
To ward off evil spirits, it is more effective to go to the temple and ask for an amulet of Shurangama Sutra or a mantra wheel to wear. Of course, if there is anything inconvenient for the presence of Buddha and Bodhisattva, you should put away the relevant clothes.
There is no amitabha in the south!