不安全的关键字只能检查参数吗？

Question

我是C＃的新手，但仍在努力理解不安全的用法。假设我们有以下代码：

static void Main(string[] args)
{
   unsafe 
   {
      int myInt = 10;
      SquareIntPointer(&myInt );  //OK here, in unsafe context
   }
   int myInt2 = 5;
   SquareIntPointer(&myInt2);   // compile error, not in unsafe context
}

static unsafe void SquareIntPointer(int* myIntPointer)
{
   // Square the value just for a test.
   *myIntPointer *= *myIntPointer;
}

但是如果我将代码更改为：

static void Main(string[] args)
{
   int myInt2 = 5;
   SquareIntPointer();   // OK here, but why?
}

static unsafe void SquareIntPointer()
{
   int random = 10;
   int* myIntPointer = &random;
   *myIntPointer *= *myIntPointer;
}

所以我们这里没有任何编译错误，但是SquareIntPointer方法不是仍然在处理方法体中的指针类型吗？并不意味着仅检查参数以查看其是否为指针类型？那会有点愚蠢。