The archaic form 灋 held water 氵, a mythical one-horned beast 廌 that gored the guilty, and 去 'to remove': justice as level as water, wrongdoers removed by a truth-detecting unicorn. Simplification kept the water and the going.
办法 the way to get something done — 没办法 'nothing can be done' is China's shrug. 方法 method, 法律 law, 语法 grammar. 法国 is France — the 'law country', named by sound. 书法 is calligraphy: the law of the brush.
Justice level as water 氵 — the LAW, and every METHOD that follows it.
The justice-beast 獬豸 from 法's archaic form still stands outside Chinese courthouses in statue form — a unicorn doing jury duty for 3,000 years.