if hed 3bet all in on the turn then maybe you could find a fold to a suggested better hand, but he didnt so with that much behind and your turn play you arent folding the river.
Looking at opps trun stack size id have raised too so that he didnt just insta-push any river forcing me to call a slightly larger bet than i might want to. WIth him only having a half pot bet left on the river you have to call so the turn raise is ok for me.