Lost 2.1 BTC today ......nice day

Yes losing is bad, but it doesn't make the game wrong.
In life you win and you lose. Gambling is the same. The mount you risk is the amount you are willing to lose.

Everything else is a bonus

Let me ask you something, how much win will you stop? I dont think that you will stop on small win right? Like if your balance is 0.01 and you only got 0.0001 will you stop it? It is different if you have 1 btc balance and then may be you can stop on 0.01 because 0.01 and 0.0001 is really so much different in their value

This is pretty well how we all react when we win or lose something. We'll blame the game (In this case) and we'll not say that our desire to win more money and the subsequent loss due to overall random chance was the cause of it.

I do not believe gambling is wrong in and of itself, its only wrong if someone abuses it (In a similar way to prescription drugs) and it becomes crushing and controlling in their life. Gambling sites exist as a business, and there is nothing wrong with a business.

everything we do, it have a risk no matter what it is
so when you lose and you angry, you shouldn't play gambling

Gambling has nothing wrong and it is the users that make it look wrong at anytime.People gambling blindly and chasing their losses make gambling look bad, if you gamble for fun then i see no problem

Precisely. This happened to me once, and I end up losing more than what I've deposited into the website.
Fortunately, that is the amount of money that I can afford to lose.

Something small for you can be big for someone else and then it gets subjective again.However, gambling with all the coins in your wallet or savings is one terrible idea,it can only result bad cause the amount of pressure you will have then is gonna be insane.

This is the full story about gambling. Just play for fun, not to make a living of it.