Bears have sent the stock down 30% year to date, but bulls recognize a great buying opportunity.After plunging more than 33% since the start of the year (as of this writing), shares of United Parcel Service (UPS -1.01%) have failed to deliver for investors in 2025.But does this disappointing performance mean the stock should be completely forsaken, or is there a buying opportunity presenting itself? Let's see how two Fool.com contributors tackle this question. Things may be rough now, but that doesn't mean ...