Abolition of Katakana theory

The purpose of any languages is just only the communication with others, no one would deny this opinion?
As a proof, it is reported that the reason why ancient Neanderthal disappeared  with the shape of the skull to form inferior articulatory to communicate well in spite of almost the same in another body functions as our ancestor.
As we know, Katakana is mainly used to show and explain the words from foreign countries in order to just imitate the sound and the imitation method are often mistaken, so original foreign people do not understand to hear Japanized and imitated sounds. So, distorted loan words expressed in Katakana are understood only among Japanese people, not among foreigners.
Also, this might be a reason why Japanese expression in English sound strange that can prevail only in Japan.
On the other hand, Japanese is fond of using noun English, only noun?
Why not, verb, adverb, preposition, adjective and adjunction?
Some Japanese makes little of alphabet letters because of only 26 sound letters having no meaning with one letter, and English word is formed by less letters, but often I cannot understand the meanings written in Katakana but shown in English letters I can, because even in English, the word has some meanings.
As my selfish and one sided opinion, recommend I to abolish all the Katakana!
Once we start Net Surfing, we come to English sites very soon, don't you think?
Do we continue and insist the mind controlling "Policy of Isolation" that is long lasting one since Edo period?
Katakana is the criminal and root case that inhibiting the developing of Japan.
Katakana culture is not a worthy one!
We have Kanji and Hiragana, they are enough for us!