fences are symbolic brother. they will be laughed at and ripped off for scrap. a proactive approach of addressing the issue and resolving it will be much better.
I believe they are part of the solution. That doesn't mean we stop talking to Afghans and various groups(apart from India, I don't think India can play any positive role when it comes to peace bringing peace on Pakistan's west border) that can play a part in bringing peace in the region. Afghan people can do with some peace considering their country has been at constant war since last 50 years, we had a massive insurgency all over Pakistan and look at the damage it caused so I cannot imagine the horrors the civilian Afghan population has faced for so long.