When I first saw it I thought people were making a fuss about an all ages version being released (there are some people who think going all ages at all is a betrayal), but yeah, there are very extreme cuts.
Don't get me wrong, I'm not saying you have to buy everything that's put out. But let's be real, piracy is extremely rampant in VNs and the English publishing scene (which this release of Kanon is afaik not involved in) is small enough that it does a lot of damage. Now I get why people pirate, and let's be real, everyone pirated or pirate something, be it because of high costs or financial trouble or even just ease of access. But you need to make a distinction between boycotting a big AAA company making millions and boycotting a small publisher that hardly breaks even on a good day. And cases as dire as Kanon here are far from the norm. We're at a point where you have probably dozens of releases across the board yearly and most of them are fine, but people still make blanket statements about how all localizers need to die, even though I'm pretty sure for the majority of them they'd be hard pressed to find anything wrong or egregious enough to bring up. It just becomes virtue signaling and screaming into the echo chamber.
Be critical of what you're getting and ignore releases that offend you, but don't throw the baby out with the bath water. People say the wildest things at the drop of a hat.

But yeah, otherwise I agree this release of Kanon goes too far.

The people saying this are jumping at shadows - the line in question a biblical quote about going down while taking down your enemies with you, which I thought was an appropriate descriptor and biblical quotes are used quite often in 86.
I don't put propoganda into my work, and frankly the entire situation just feels like people found out I'm Israeli, got upset at me for not being sorry enough for being one and decided to write callout posts about it when they found one line that can be read as adjacently zionist.

Sadly I've gotten used to people turning on me on the basis of my nationality over the course of the last two years, but having people who were once very supportive of me make callout posts asking for my work to be boycotted is still hurtful (even though it is well within their rights). But in case this needs to be pointed out - no, I don't insert politics into my work, if anything working on fiction is how I distract myself from politics.
I hope this clears it up.