We shouldn’t, because we’re better than that.
And yeah. I know exactly how close we came to being utterly destroyed. Not even. Like I said, we’d have been a lot worse off, pony’s lives were in jepordy, but we were never in danger of being taken over.
The public seems to forget too often that for one thousand years the Elements of Harmony were unusable. Think for five seconds about all the times Canterlot and Ponyville alone have been attacked in the last two years. If they- the elements, were the only line of defense we had, how would we have survived that long? Princess Celestia is a fair and just ruler, but she’s not a fighter. Not a defender. Up until a few weeks ago I’d just assumed the rumor that she’d taken a vow of non-violance was true.
Here’s a little secret. By the time Princess Cadance had freed Shining Armor and he had used his barrier to repel the changlings, the treasury holding the Elements of Harmony had been secured again. There was a unit starting its way to the throne room. Could they have stopped Chrysalis where Princess Celestia had failed? Probably not. But they could have freed and empowered Shining Armor and Princess Celestia faster than Chrysalis could have bat them down.
That’s not even counting the group that was advancing to awaken Princess Luna.
Equestria’s safety does not rest on a needle’s point. We don’t resort to acts of cruelty because we’re stronger and better than those that do.