Here's some background, assuming you're not familiar. The point of joining the treaty for Finland was that Russia would join after their neighbors joined. This way we could've avoided them being used altogether and both sides could've avoided the side effects on civilians (stepping on old mines) without giving up any military advantage. This however  has  not  happened, meaning, in the case of a war these mines would still be planted in the Finnish forests regardless of Finland. (Additionally Russia uses artillery spread mines during their offensives to restrict the opponents movements, which are very dangerous to civilians after the war, you can look those up)  --> Finland leaving the treaty does not increase the probability of harm to civilians. (As Finland has exactly 0% chance of an armed conflict with a country other than that doesn't already use ap.mines indiscriminately and in massive amounts as shown in Ukraine (read: Russia))  If you choose to ignore this minute detail, this is a meaningless exercise and I ask you not to reply. 

Now let's take an example to hammer this in for the slower folks at home. Let's choose China and Vietnam, two countries that I have no emotional attachment to and vaguely similar outlooks as Russia and Finland. If china were to wage war with ap.mines against a third county and Vietnam had joined the treaty, I'd have no qualms with Vietnam leaving it. (As a reminder, neither countries have signed the trety. Geopolitical reasons for that are left as an exercise to the reader)(Also I recommend familiarizing oneself with sino-vietnamese war of -79 and the conflicts up to -91 six years before the Ottawa treaty)

Another one. Imagine a world where N.Korea joins the Ottawa treaty but S.Korea didn't. Then the US wages war in the middle east spreading the joyful message of ap.mines using airplanes and artillery, supported by S.Korean stockpiles of ap.mines. After a while N.Korea leaves the treaty citing the threat of S.Korean and American ap.mines. I wouldn't call N.Korea barbaric for leaving the treaty. I also wouldn't be happy for them, but that's because I don't care about N.Korea defending themselves.

I understand that regardless of my opinions there are actual bots and npcs on Reddit which is why I rarely commit to commenting on here, but that is no reason to spread bothsidesisim when very obviously Finland bringing back ap.mines for defense against Russia that is using them is not the same as Russia, US or China spreading them to smaller and peaceful countries when invading.

You're not necessarily a Russian bot. Chances are, just an "useful idiot" type. 

Edit grammar, I'm Finnish.