这是从一本学英文作文的书上看到的，但作者没翻译解释
想请问版上高手如何解释？
Killing for killing's sake is a terrifying phenomenon and as
strong a proof as we could have of that "reality of evil" with
which present-day Philosopher are again concerned.
试译:为了杀人而杀人是令人害怕的现象，而且同时也是个强而有力的证据支持我们可
能拥有邪恶本质－－至今哲学家又再度关心的话题。
我想问的是 1. as strong a proof as
过去所学 as(adv) soon(adj) as(连) possible(it is possible的省略)
那为什么soon 可以改成 strong a proof?
2. we could have of
这里怎么会多一个of?