It is because they are not used to being penalized for it. Remember, that La Liga is not refereed by Dutch officials. VAR has not been implemented in most European leagues, yet.
Seem like that Spain player still trying to protest with the referee during the half-time break about that handball. Seriously dude, let it go. You are SPAIN, you more than capable of score a goal, so concentrate on score goals during your second half. If you fail to score one single goal against Russia in this match, then, I'm sorry, you deserve to lose.
Without a further analysis, this really is sad. But there is a more offensive flair to many teams, and there is generally weaker defending across the board. Thus, there is more play in the box leading to more OGs and more PKs. This includes Spain.
He hasn't played anything close to a full game yet. He came on late vs Saudi Arabia and departed all three games before 70 minutes. I'm thinking it must be fitness. The Russian coach must not think he can go 90+ minutes.
From a geopolitical point of view, I want Spain to send Russia packing. But from a soccer point of view, this game is making me get over Spain.