Don't make Snyder the big bad, just because the fanboys have a hate-on for him. Try to learn how these films are actually made:
Snyder is in the public eye, and probably has a fair amount of veto power, but he is not in charge of the DCU -
remember Nolan and Goyer? They were on the DC team first. Nolan hired Snyder for MoS - after Del Toro and Zemeckis turned him down.
And Snyder doesn't write the scripts. He influences the stories as part of a production team based around Nolan and Goyer. For BvS, all the dramatic beats, all the dialog, were put on the page by Goyer and Terrio. There's no indication Snyder didn't stick to what they wrote (apart from the usual on-set improvisations).