How would you feel about me threatening to throw the previous homeowners mail from the irs in the garbage?
Why would you throw away important mail from the irs that doesn't belong to you?
It's not a big deal. They were lousy homeowners and left a ton of mail in the first place
They may have been lousy owners but throwing away someone's mail is against the law. If someone happens to see you do it or records it you'll be in some serious trouble. You don't want to get arrested do you?
I'm pretty sure I won't get caught
Do you really think the risk is worth it? Instead, you should simply write on the mail return to sender, or owner no longer lives here so the mail man knows not to deliver it in the future.