Sol's actions don't bother me, which let me be clear, is not saying what happened was written or presented as well as it could have been. I've seen a group of force users, presumeabley from more lightish traditions, who had gathered for a great big philosophical talk, react with violence when someone from a tradition they viewed as dark just showed up to ask if they could join.
Hell, Sol was more than likely trained by a padawan who saw what happened with the Nihil, or knew what had happened. In the wake of the Nameless, a creature that literally turned you to dust my projecting fear through the force, "act first, think later" would be a reasonable thing to be taught to Padawans dealing with beings able to manipulate thoughts and perceptions through the force.
Hell, he seems to be buddies with Verne, probably heard about Zeen Mrala, a young force user raised in a cult that preached against any manipulation of the force, and hated the Jedi. And her story makes quite clear the parallels to real life issues of young people raised in strict religious households. Right down to her nice guy, homophobic childhood friend joining the Nihil (Star Wars vikings) because Zeen turned him down for a girl. And lets be honest, if you just saw the kids with Mother Maul, would you think it is a good place for kids.
But that is just me being a big High Republic geek. They absolutely did not present the situation as best they should have, even keeping Sol in as the wrong as he was in this episode. I get the feeling they are trying too hard to draw parallels to Anakin and Quigon in TPM, as a narrative short hand.