https://www.bbc.co.uk/news/articles/ckgj70nnrkjo
Someone else on holiday without travel insurance.
"He doesn't remember much about his holiday or the accident, but witnesses said he was trying to climb from his bedroom balcony to his stepbrother's balcony in the next-door room."
From what I've read when I look at travel insurance policies, they are very strict on not paying out if the accident is due to circumstances like this.
From my policy on exclusions - where they will not pay out
Any deliberately careless or deliberately negligent act or omission by you.
10. Any claim arising or resulting from your own illegal or criminal act.
11. Any claim arising directly or indirectly from your drug addiction or solvent abuse, alcohol intake, or you being under the influence of drug(s).
I think it's really important that people take out travel insurance - but even then, I don't think it will pay out if you get injured to due acts like this.