If you play Fire Emblem, you'll probably understand. Often you'll be trying to get into fights where you will keep your advantage. If you're trying to hit something that has a 40% chance to hit you and a 2% chance to crit, while having a 96% chance to hit and take down your target, you'll more often than not go for the attack. If you get REALLY unlucky, though, then what will happen is that you'll end up missing your attack, then your opponent will not only proceed to hit you back, but crit you in the process, thus taking down your own character. I'm pretty sure anyone who's played a couple of Fire Emblem games could recall at least one of these events, so share below if you've got any. Recently something like this happened. In Fire Emblem Echoes, I was one attack away from defeating Slayde in the final battle of Act 1 with all my ranged units (Archer Tobin, Mage Kliff, Python, Priest Faye, and Alm with the Lightning Sword). Faye was the least accurate, but 65% is still a higher chance to hit than not, with the rest having a hit rate anywhere from the high 70's to the mid 80s. Every single one of them missed, however, and because of that I actually ended up losing a unit. I know the accuracy in general for that game is kinda... shaky... but still.
Fire Emblem Awakening was much more generous with hit and crit percentages than Fates, at least in my experience of playing it. Fates was just brutal. I once had a 96% chance to hit while the enemy had about a 7% chance and 1% chance to crit... guess who missed and guess who landed the hit with the crit! It cost me the mission and needless to say after that I put the game down for a good 6 months.
I've played Awakening, Fates, Echoes, and Sacred Stones. Boy, let me tell you that my luck in all the games is pretty terrible (Especially in Sacred Stones when the enemy can turn your units against you). I've lost units because of RNG and because I make mistakes, but overall, FE isn't that hard of a game if you know what you're doing...Keyword If...