We know by default the wordpress justifies text left, but that left justification leaves the text uneven towards the end of the line and across images. You can justify each paragraph manually in the wysiwyg editor but thats also a tedious task. Imagine if you had 1000 posts and now you would have to edit them manually. Not worth the effort.
Don’t be afraid its a simple CSS fix and you can do it in 2 minutes. By doing this fix all your existing posts and new posts will be justified.