The thing is OP, I don't think people here are being deliberately "mean" to you.
I completely understand why you feel so shaken up - it's never comfortable to have your parenting or family set-up inspected. And of course there's often the irrational fear that your children will be taken away. Lots of us would feel the same to a greater or lesser degree. So I totally hear where you're coming from.
But try to look at this objectively from the perspective of an outsider reading your comments.
You told us that your DH visited the GP and said he was suicidal albeit he didn't have any concrete plans. Your DH has a shotgun which has been removed by the police. Although you agree in some posts this was fine, you've also said that the reaction was excessive and unnecessary. You've also said that your DH wasn't suicidal and you dismissed this as just an episode of depression due to life stresses. You've gone on to say that you and your DH agree that it's best not to tell the GP in the future if you are depressed and/or suicidal. You've also asked repeatedly about whether the school will be told.
Can you see why people have been a bit blunt with their responses?
As an objective outsider it really does feel as if you're minimising your DH's depression. An episode of depression of the severity you describe doesn't just melt away, so even if he only mentioned suicide as an ideation rather than being a definite plan, his mental health needs proper care and attention. Suggesting that you won't now seek medical attention in the future is a real overreaction, and that kind of attitude won't help your DH. He needs to be encouraged to seek help if he needs it - lots of men struggle with their mental health, and stigma is one of the reasons why suicide is so high for men. Also asking repeatedly about whether the school would know suggests a focus on people knowing rather than things being actually OK.
I appreciate you're still caught up in the whirl of emotion and maybe aren't thinking quite straight. But maybe re-read some of the comments you've written and it might help to explain why some PP are doing some straight talking.
If you'd come on here and did the same first half of your post, and said you feel worried and humiliated, but also just concerned for your DH's health, you'd have got a different response. It's because that it feels as if you're waving the seriousness of his episode away (which may just be because it's extremely hard for you to confront). And it does feel as if you're really quite cross about the reaction which despite your comments saying you agree, you have still said you think is over the top and unnecessary.
I'm not saying this to put the boot in, but rather to explain why you've had some blunt replies. MN is usually pretty hot about both mental health and the welfare of children, and your post presses both of those buttons, albeit unintentionally.
I find most people are pretty empathic on MN, but sometimes the most honest responses are hard to read because it can hit a nerve. Give yourself a bit of time and space to breathe, focus on your well-being, your DC, and the health of your DH. Everything is fine. What other people do or don't know doesn't matter.
I hope things calm down for your family now, and your DH continues to do well.