I will say that actually in any type of betting the possibility of losing can never be avoided, no matter where you bet whether it is in the type of gambling that is pure luck such as slot machines, dice or in the type of sports betting which is as we know that skill and knowledge are quite helpful in terms of bringing us closer to the chances of winning.
But the fact of the matter is that betting is still betting, the possibility of risk is more often involved than the chance of winning, because the concept of betting is that you bet your money on two possibilities at the end of the session between winning or losing and something that has not happened yet can never know the result unless you have completed the session.
In betting whether sports or any kind, luck plays a very good role, you might be a skilled bettor and even have play less risky games but you'll still need luck sometimes, for instance In the EPL, you'll see the less stronger team beating a top team that stands top 3 in the table whereas it's supposed to be the other way ground, then you'll see some people saying the house is influencing the game or it's a fixed game but that's not true.
Therefore every individual that's into gambling needs to have it in mind that gambling requires luck to as well as good skills and strategies. Yes I agree with your statement, betting is betting and it's either you win or lose, that's why sometimes i tend to wonder why some individuals get emotional when they lose, when they're already aware of the risk involved in it and since they know they could either lose or win they should accept any outcome of their bet.