Elon Musk is purchasing Twitter because he was upset that Twitter had suspended an account that was mocking a transgender female.
Tesla CEO Elon Musk explained why he bought Twitter in a tweeted note in which he spoke about promoting a "digital town square" where various beliefs can be expressed within limitations.
The reason I acquired Twitter is because it is important to the future of civilization to have a common digital town square, where a wide range of beliefs can be debated in a healthy manner without resorting to violence.
On April 14, he made an unsolicited offer to purchase the company.
Twitter's board initially responded with a "poison pill" strategy to resist a hostile takeover, but unanimously accepted Musk's buyout offer of $44 billion on April 25.
In July, Musk announced his intention to terminate the agreement, asserting that Twitter had breached their agreement by refusing to crack down on spambot accounts.
The company filed a lawsuit against Musk in the Delaware Court of Chancery shortly thereafter, with a trial scheduled for the week of October 17.
The deal was closed on October 27, with Musk immediately becoming Twitter's new owner and CEO, and Twitter was taken private.