Takehisa is pretty much just a hot-blooded type of dude and not some scum. If this wasn't Japan, given how strict or controlling the schools there are, and he joined some combat sports and did some competitions, he probably wouldn't even be a delinquent/thug.
Chewing on some dried squid and drinking some sake while reading this. The squid is essentially gum, I'm just chewing and hoping I can finally eat it. Still like it tho.