Okay:
so no matter where in the world you are, things like that... need to be corrected. And the kid(s) disciplined etc.
No matter where you are in the world, there is "right" and "wrong," appropriate/inappropriate.
AND if this happened in school (at my kids' school for example), AND another kid got INJURED and/or it drew blood or caused bruising or a lump or whatever... the SCHOOL/Teacher/Health Aide, would be processing this/handling it, per their role at the School and PER the school policies and procedures. AND the parent(s) hopefully, are also informed of it. Schools need to also fill out an "incident" report per certain situations.
All schools here, whether it be private or public, have, policies and procedures.
In Kindergarten, being this is Elementary SCHOOL... a child is expected to know and follow school rules etc. And to learn not only academics, BUT about, behavior too.
Now, I have in-laws from Europe. A cousin of my kids came here once to visit. She also spent a day at my daughter's school, for a day. Now, she made a comment that during lunch at my kids' school, that "lunch in the cafeteria is boring...." So we asked her why? And she said "because no one makes trouble.... at my school at lunch the kids are all loud and throwing food and making trouble, just kids having fun...." and nothing is done about it. The cousin even said "it is CHAOS.... " The cousin noted how the kids here at my kids' school is "so behaved..." and she was surprised.
Um okay! She even told my daughter's Teacher that. And growing up, my Husband who is also from Europe, said that kids behaved, much like the description you noted in your post. Um, okay! But he agrees, that it is bad rude behavior. But the Teachers there are different. The schools there are different, etc. Not that it is "better." It is just that the kids are pretty much on their own and off on their own. No matter what age.
Again, not that it is "better." Even my Husband said that. And he is from there.
ETA: the Kindergarten Teachers at my kids' school... do not just blow off behavior like that. They don't say oh well they are young and kids do that. No, the Kindergarten Teachers, are very proactive in ALSO teaching the young kids, who have just started Elementary school... HOW to behave and what is right and wrong, appropriate and inappropriate. And they DO, correct those behaviors, as much as they have to. Why? Because, these Kindergarten kids, will then go on... to 1st grade/2nd grade etc. and behavior like that needs to be, addressed.
Not just blown off.
It is, school.
If your own kid was doing that, at home... it would not be "allowed" right?
If it were my kid that was being scratched, I wouldn't like it.
And ripping up school property, and making graffiti... that is not nice.
It is school property... it costs money to clean up and replace things.
etc.
It is school.
Not daycare.
As for peeing in the garbage can... well, my Husband who is from Europe said, they did things like that as kids too, as teenagers too, and adults too. He said if they had to pee, they did. Sure, they can go to a bathroom, but peeing like that is lazy. Disrespectful of the place etc. Now, it is no wonder, that some places in Europe, reek of STINKY pee. They have a different... attitude about it. Or whatever.
Once my son when younger peed in the yard. And tried to do that at a park once, just in a corner of the grass. NO I told him. He said "But Daddy said they did that when they were kids...."
I tell my Husband, SEE what you taught him. He thinks it okay and fine and cool. Ahem.
No. You don't just go around peeing wherever you want.
Even a Toddler can learn that.
So a Kindergartener, can too.