If you drove a car drunk and it turned into a police chase, would Japan be okay with it or would they put you in jail and/or deport you?
If you snuck across the Japanese border with intention to live there undocumented, would Japan be okay with it or would they put you in jail and/or deport you?
If you posted social media saying you wanted to overthrow the Japanese government, would Japan be okay with it or would they put you in jail and/or deport you?
Literally anything involving a gun and a crime, would Japan be okay with it or would they put you in jail and/or deport you?
If the answer is "no", you're probably feeding too heavily from ideology. The reality is that most countries, including far more stable and peaceful countries than the US will ever be, are far less tolerant of crossing borders illegally, drunk driving, gun offenses, etc. With their own citizens, to say nothing of foreigners on visas.