As is often the case it's in the eye of the beholder. My eyes see people "celebrating" different cultures.

so, like when does it stop being "celebrating a culture" and start being stereotyping? you know?

Presumably someone somewhere is greiving the loss of Cho? And no doubt feeling guilty for not acting to help prevent his horendous actions. I don't know if it's appropiate to include him in this memorial, but I do think we should avoid de-humanizing him.

"You blinked! I saw it! I win!!!"

"Transcend into the bliss, let go of your anger, remain in the present. Your percieved need to itch that flea bite is only the physical distraction of the ever suffering body... let go...no it's not dinner time yet."