Is it against the rules for OP to post whether he should

Check 4chan.org/rules

>>16914926
Is such action considered as illegal though?

>>16914928
>is killing illegal

Hmm. I think there are other questions here, like why?

>>16914928
Oh you mean if it's against the law to admit to considering murdering someone? No I'm fairly certain it isn't in most places unless you're actually planning but it's not a good thing. And it may be seen as a death threat which can certainly illegal.

Bad idea if you're looking to not get caught or actually going through with it.

>>16914861
No, but it is against the rules to post a query whether it is against the rules to post that query.