The image above happens to be centered. The caption also has a link in it, just to see if it does anything funky.
This is a paragraph. It should not have any alignment of any kind. It should just flow like you would normally expect. Nothing fancy. Just straight up text, free flowing, with love. Completely neutral and not picking a side or sitting on the fence. It just is. It just freaking is. It likes where it is. It does not feel compelled to pick a side. Leave him be. It will just be better that way. Trust me.
And now for a massively large image. It also has no alignment.
The image above, though 1200px wide, should not overflow the content area. It should remain contained with no visible disruption to the flow of content.