You'll find it less confused if you don't quote out of context. I wrote:

In addition to the financial aspects, [a no-deal Brexit] will almost certainly return us - on both sides of the border - to violence and personal endangerment. (And is Britain really prepared to send in armed forces?) No Irish government is going to sit still for that. Why should they put their own citizens at risk?

In other words, the question about armed forces is parenthetical - and rhetorical. The not-sitting-still referred to the dangers of a hard border, in light of the pressure May is putting on Ireland to limit/weaken the Backstop - which is the only thing preventing it, if there's a hard Brexit. A closed border, sooner or later will result in violence here, on both sides of it. Maybe I didn't make it clear (I was also writing in light of my previous post a few messages down.) But a hard Brexit is looking increasingly likely, and the domino effect is all too inevitable.