I also don't think this was appropriate advice to give someone....who has a husband who has a history of physical violence towards her either. True, he may be bluffing about using that gun on himself (probably doesn't have it in him to follow-through on that...I'll agree) however, calling his bluff could trigger a different response towards HER. (BTDT myself)
Yes, I agree he could control his anger (if he really wanted to, if it were important enough to him to do so)....but so far, he hasn't ever truly done what it takes to do that. Hasn't even shown true signs of really wanting to. Yes, he's gone to a couple of counseling sessions, but he quit....LONG before any true progress. He made a showing of it, that's all.
I ask you to try to keep in mind that Chrissy is dealing with someone who HAS acted out physically towards her in the past when he felt threatened.....when you give her advice.