Frankly, I get so tired of the whole "grammar police" or "spelling Nazis" comments. If you want to remain ignorant and uneducated, don't read the post. And stop imputing evil motive to those who offer corrections.
Some people are educators. Not in necessarily in occupation, but in their nature. And their inclination is to teach, not to make themselves look impressive and smart, but to help others be better, whether it's the person they're replying to or to anyone else, like me, who happens to come along and who appreciates learning these things.
Though Sakura is a bullet train from Kagoshima to Osaka so I think it should be changed.