I'm not really sure what you're arguing.
Haly was saying that it was dumb that Dany torched the train, and I argued that it wasn't.
Now, you've chimed in. Firstly, you dispute point three by stating that the show didn't used to be about blowing things up. Bullshit. Dany's entire arc in season one is her attaining this firepower, and, in every season since then, she's been one step closer to "blowing shit up." This was a long time coming, and it's not the first time she's shown off firepower.
Now, point four, I'm really not sure what you're talking about. Neither Haly nor myself mentioned degree of threat when debating whether the wagon train should've been burnt. In fact, your response, that the train contained a ballista, supports my opinion that Dany was right to burn the train.