Well, your perspective regarding it is quite wrong. Smartphones/electronics, cricket, hockey are all created by non-muslims, how can a self-respecting Musalman celebrate world cups and what not?...
The issue here is how basant is celebrated in our country. It is basically an un-organized skill based event and in this game there are no rules. The sky is battlefield and every kite in the sky except yours is the enemy, the goal of the event is to beat as many kites as you can while having fun doing so. Usually Chinese kite-flying is quite bland, people fly kite and they stand there reeling it out and reeling it in. But here in our culture it is a competition like kushti/wrestling etc.
The original reasons might be different, but why we Pakistani's celebrate it in spring is because of the weather. You can't do it in summer because of low wind flow and heat. You cant do it in winter because of cold and rain, you cant do it in autumn, because of dampness in wind and fast wind flow. That's why spring is chosen and the date for basant is set not because of some religious reason's but because of a committee, so that every one is on the same page. There have been various occasions when basant had to be postponed because of weather conditions. The reason it is on one day is to have maximum number of kites on the sky so that it doesn't get boring. So that you are in a continuous competition.
Plus it appeals to everyone. Even the poor can get into the fun, for them it's like fishing, all they have to do is wait and they can grab/loot other peoples kites. For boxing you need gloves, for cricket you need bat/ball, for football you need football, but for flying a kite, if you don't want to spend a dime, it's totally up to you.
All in all, it send's a positive/colorful image of the country. We need to loosen up a little bit, not because of our economic reasons but because of mullah extremist ideology that we have inherited after zia. If it were up to mullah's there wouldn't be any music, films, dramas, games, poetry etc. The world at first needs to see you as human. Baki, about faith, god works in mysterious way's, for some foreign people 'Tajdare Haram' naat by atif asalam might have introduced Islam to them, it reminds me of the incident where an MTV host became muslim after meeting Imran Khan, and I heard she was quite intrigued by nusrat fateh ali khan's qawali, that's what brought her in to do her research on Islam. I am going off the tangent here, but basically the world sees you as long bearded, shouting, suicide bombing terrorists. Now this image doesn't change over night with all the western media being against. So you need to lighten up your image as much as you can, be inclusive as much as you can. Faith, itna kacha bhi nahi hona chahiye k gana sunnany ya patang urana se toot jye..