Idealism vs. Materialism "Reasoning concerning causal interactions, however, can lead to an understanding of the physical world as a realm of causal interactions with which we all interact."
Maybe I misunderstand you, but I fail to see how this is harmful. Any examination of reality eventually leads to cause and effect in an endless chain that is always carried out in observance of man's pride. He/she unlike other animals can look back, understand, and master reality but only through the fogged lens of his desires, through the senses and mental faculties he has been endowed with presumably honed for acquiring the means of subsistence - and thus he has to constantly fight in a pathetic attempt to break away from his yoke.
"I do uphold that perceptions are important, but very much believe that the external world can best be evidenced via its causal interactions, this whenever the question of its presence holds a potential to arise."
Keep in mind that we are in no way distinguishing between what is correct, false, true, erroneous, that these are all separate from what it means to be a subject of the material world.