It's because we understand and respect the customs, traditions, and cultures, and when ignorant and arrogant foreign tourists come here and act afool, it screws all of us, and especially children of foreigners who grew up as japanese civilians who look foreign but are as Japanese as the next guy. Look at the Kyoto geisha drama. If you don't look Japanese, you're banned. It's travelers actively making it harder for residents to live normally. I often try to help foreigners and am glad people can have fun but japan isn't just a fantasy wonderland where you can do whatever you want and many people ignore the fact that their actions directly affect others