Hashem gave us a brain for a reason. Yes, it is to learn Torah, but it is also to understand and enjoy the world around us. It is not for nothing that we say a bracha “SheChalak m’Chochmoso l’Yerei-av.” We have an obligation to use the talents Hashem gives us, for learning and for growing in all aspects of education. We need doctors, scientists, GOOD educators, plumbers, electricians, carpenters, accountants, farmers. None of these things can be accomplished without education in secular areas of life. If all Jews ONLY learned Torah (and when Moshiach comes we can experience that), there would be no Jews learning how to do the other things that sustain us in life also.
A yeshivah bochur in Kollel does not know how to suture a wound, much less do brain surgery. Secular education is needed for that. Any frum Jew who believes otherwise, had better pray hard that he never needs the services of someone who also had a secular education.