I'm not surprised by your answer. You only look at it in the way that benefits you.
The NATO purpose....'NATO’s essential and enduring purpose is to safeguard the freedom and security of all its members by political and military means. Collective defense is at the heart of the Alliance.'
While you might not make any enemies or pick a fight, some one else might attack another NATO member. The NATO Alliance will help defend them, attack one and you attack us all. It was determined and agreed, a 2% GDP investment by each member in itself(military) keep the Allliance strong and even a deterrent.
The majority of NATO members still are not reaching the 2% goal, only 9 or 10 out of 30 currently do after continuing push from Trump, something both Bush and Obama did before him with little success.
It's not too much to expect, should there ever come the day, that some of the slackers be able to join the fight with more military might than a Boy Scout Troop.
The U.S. contribution to NATO has certainly been substantial and vital but the U.S. is a global superpower with interests that extend far beyond Europe. Presidents from Harry Truman onward have all considered membership in NATO vital to American military interests. The exception is Trump. U.S. politicians on both sides of the aisle condemned Trump's typically divisive and inaccurate remarks concerning NATO countries being "in default" or not paying their "fair share". The president has also said "NATO was going out of business" before he came along, suggesting member states weren't dedicating enough money to defense — money that they spend on their forces, but which does not directly go to NATO as an organization. Trump echoed these sentiments in another tweet, taking credit for the increase in defense spending among NATO members in recent years. That was an outright lie. The 2% GDP commitment was made by all NATO partners in 2014, when former President Barack Obama was still in office. Annual defense spending from European member states and Canada, as a share of their GDP, has been steadily increasing since 2015 — all before Trump was president. The 2% goal is set to be realized by 2024. As you said, many have already met the goal and all other NATO countries are on track to meet it. U.S. contributions will decline. Trump ignored all that, playing to his base with more deception to pump up his own tires.