While I am sure there are some, and perhaps even many that genuinely think so, (which is fair), you must admit that a great percentage of those against, are against just because it was DJT. I won't even get into the rest of the world.
In addition, not to justify, but a big part of the reason many close their eyes and ears to potential arguments, is specifically because of the knee jerk reaction of the other side. (I imagine this happens both ways). However, there are many who see both sides, but support DJT's actions in this situation, and it doesn't mean they are biased because of Israel. In addition, many may not have given the green light if it was up to them, but now that it is done, are at least happy that he is gone, albeit somewhat apprehensive about possible repercussions.