I take responsibility of my losses since it's my decision to gamble my money. This is the reason why it's a must to know what you're getting into before playing. Because losing is inevitable in gambling. Hence we should know the consequences to become prepared if worse case happened.
Playing in moderation, self control and acceptance (in facing losses) are crucial. If you can't bear losing your money and will just blame the casino or others for your losses, then better to not gamble at all.
It's the same way: when we gamble, we must be prepared to lose the money we deposit. That's why it's important to assess our financial capabilities. Betting within our means is sufficient. Furthermore, blaming or venting emotions for lost money on others is completely unreasonable.
Unreasonable but expected. Ranting, blaming, venting negative emotions, either through chat or through different means is a way of a gambler to release his madness. Sure, it's not right but there are worse things that could happen if a gambler cannot release that emotion. I've seen streamers who destroyed their keyboards, monitors, and there's even one who smashed his smartphone due to frustration.
These kind of actions can be prevented if they can rant their emotions in a chatbox or maybe a channel where it will be welcomed and accepted.