However, he expressed sadness at what he described as the "extraordinary and untenable circumstances" surrounding Mr Trump's permanent suspension.
He also said the ban was in part a failure of Twitter's, which hadn't done enough to foster "healthy conversation" across its platforms.
Twitter has been praised and criticised for freezing Mr Trump's account.
German leader Angela Merkel and Mexican President Andres Manuel López Obrador - neither an ally of the outgoing US president - spoke out against the tech titan's move.
In a long Twitter thread, Twitter's chief said he did not celebrate or feel pride in the ban - which came after the Capitol riot last week.
He reiterated that removing the president from Twitter was made after "a clear warning" to Mr Trump.
"We made a decision with the best information we had based on threats to physical safety both on and off Twitter," Mr Dorsey said.
He also accepted that the move would have consequences for an open and free internet.
"Having to take these actions fragment the public conversation. They divide us….And sets a precedent I feel is dangerous."
He also addressed criticism that just a handful of tech bosses can make decisions on who does and doesn't have a voice on the internet - and on accusations of censorship.
"A company making a business decision to moderate itself is different from a government removing access, yet can feel much the same," said Mr Dorsey.
The decision to remove users, posts and tweets has been criticised by some for violating First Amendment - free speech - rights.
However Big Tech generally argues that as they are private companies, and not state actors, the law does not apply when they moderate their platforms.
Posts
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We offer majorly two types of advertising:
1. Sponsored Posts: If you are really interested in publishing a sponsored post or a press release, video content, advertorial or any other kind of sponsored post, then you are at the right place.
WHAT KIND OF SPONSORED POSTS DO WE ACCEPT?
Generally, a sponsored post can be any of the following:
Press release
Advertorial
Video content
Article
Interview
This kind of post is usually written to promote you or your business. However, we do prefer posts that naturally flow with the site’s general content. This means we can also promote artists, songs, cosmetic products and things that you love of all products or services.
DURATION & BONUSES
Every sponsored article will remain live on the site as long as this website exists. The duration is indefinite! Again, we will share your post on our social media channels and our email subscribers too will get to read your article. You’re exposing your article to our: Twitter followers, Facebook fans and other social networks.
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Submission of Materials : Sponsored post should be well written in English language and all materials must be delivered via electronic medium. All sponsored posts must be delivered via electronic version, either on disk or e-mail on Microsoft Word unless otherwise noted.
PRICING
The price largely depends on if you’re writing the content or we’re to do that. But if your are writing the content, it is $60 per article.
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Technical Details And Pricing
Banner Size 300 X 250 pixels : Appears on the home page and below all pages on the site.
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Large rectangle Banner Size (336x280) : Appears on the home page and below all pages on the site.
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Portrait (300x1050) : Appears on the right side of the home page and all pages on the site.
Billboard (970x250) : Appears on the home page.
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