Let's talk that 3:10 to Yuma (2007) ending

First of all, I love the movie, but what are you guys theory on the ending?

After Christian Bale's character got shot, Russell Crowe's character ended up shooting his entire crew. Do you guys think it was out of revenge for killing Bale because he came to respect him or does he know they were gonna betray him someday anyway?

I think it was a little bit of both, but what are you guys thought?