Hello, people, sorry for bothering.

I'm trying to change every mob to be aggressive to the player, but I can't change their Attributes to add ATTACK_DAMAGE. Can someone help me?

Mob mob = (Mob) event.getEntity();

        if(!mob.getAttributes().hasAttribute(Attributes.ATTACK_DAMAGE)){
            mob.getAttributes().assignValues(new AttributeMap(AttributeSupplier.builder().add(Attributes.ATTACK_DAMAGE, 1).build()));
        }

        if(mob.getAttributes().hasAttribute(Attributes.ATTACK_DAMAGE)) {
            mob.setCustomName(Component.literal("Aggressive"));
            mob.goalSelector.addGoal(1, new MeleeAttackGoal((PathfinderMob) mob, 1.0, false));
            mob.goalSelector.addGoal(2, new LookAtPlayerGoal(mob, Player.class, 8.0F));
            mob.targetSelector.addGoal(1, new NearestAttackableTargetGoal<>(mob, Player.class, true));
        }

Thanks.

Update, I've seen that I need "TransientAttributeModifiers" to do that, I've managed to change the AI properly, but always something "Pacific" attacks me, the game crashes. The .put to add Attack Damage seems to not work somehow. 

    public static Multimap<Attribute, AttributeModifier> getAttributeModifiers() {
        Multimap<Attribute, AttributeModifier> temp = LinkedHashMultimap.create();
        temp.put(Attributes.ATTACK_DAMAGE, new AttributeModifier("ATTACK_DAMAGE", 1, AttributeModifier.Operation.ADDITION));
        return temp;
    }

    @SubscribeEvent
    public static void onEntityJoinLevelEvent(EntityJoinLevelEvent event) {
        if(!(event.getEntity() instanceof PathfinderMob mob)) return;

        if(!mob.getAttributes().hasAttribute(Attributes.ATTACK_DAMAGE)){
            mob.setCustomName(Component.literal("Pacific"));
            mob.getAttributes().addTransientAttributeModifiers(getAttributeModifiers());
        }

        if(mob.getAttributes().hasAttribute(Attributes.ATTACK_DAMAGE)) {
            mob.setCustomName(Component.literal("Hostile"));
            mob.goalSelector.addGoal(1, new MeleeAttackGoal(mob, 1.0, false));
            mob.goalSelector.addGoal(2, new LookAtPlayerGoal(mob, Player.class, 8.0F));
            mob.targetSelector.addGoal(1, new NearestAttackableTargetGoal<>(mob, Player.class, true));
        }
    }

Thanks