I wouldnt say the Alexandrian ones were deliberately corrupted.
Why wouldn't you say that, since you should know that the Gnostics were corrupting the Bible, and Alexandria was a hotbed of Gnosticism?
Why are Christians -- of all people -- afraid of the truth? Origen of Alexandria himself may have been responsible for some of the corruption.
"John Burgon, author of scores of scholarly books on the transmission and corruption of the original Greek manuscripts said:
I am of the opinion that such depravations of the text (as found in Aleph and B) were in the first instance intentional. Origen may be regarded as the prime offender. ..the author of all the mischief...(Clement used) ‘hopelessly’ corrupt' versions of the New Testament which there is in these last days an attempt to revive and palm off on an unlearned generation the old exploded errors. He went on to say: "We are assured without a particle of hesitation, that Codex Vaticanus and Codex Sinaiticus manuscripts are of the most scandalously corrupt copies exant. They exhibit the most shamefully mutilated text which are anywhere to be met with, and have become the depositories of the largest amount of fabricated readings, ancient blunders, and intentional perversion of truth, which are discoverable in any known copies of the Word of God.( The Revision Revised, Page 336.)"
Even mild F.H.A. Scrivener -- the leading textual scholar of the 19th century (who actually wrote the textbook on Textual Criticism) -- made it perfectly clear that the worst corruptions of the Bible occurred in the early centuries.
He also concurred that Codex Vaticanus (B) and Codex Sinaiticus (Aleph) were two of the MOST CORRUPT Greek manuscripts in existence. And those two are the foundation of all modern bible version New Testaments since 1881.
He said that though it may sound paradoxical, the oldest manuscripts are the worst. And many others agreed with him. But the hoax perpetrated by Westcott & Hort was that the oldest manuscripts were the best! Why? Because they hated the Textus Receptus.