in islam fear is also as important ,

love and fear exists simultaneously,

if you love someone sincerely there is always the fear of loosing him, you do not want to do anything that will harm your relationship.

therefore fear of god is very important, when one fears Allah and his wrath, he will not disobey him.

a small child will love his father as well as respect , but he will also fear to disobey or do something against his dads will, because of the fear of being scolded or beaten,

Allah loves, but also want us to obey him, to fear his wrath which may come out of disobedience towards him.