Because MB has a rational care about the future of the team. If I may be so bold as to speak for him. He wants the Spurs to be a contender for the next decade.
Unfortunately MB fashions his language with, IMHO, an irrationale hatred for Holt. He feels that every good decision is made by Pop and RC DESPITE Holt, and that every slightly questionable decision must be the result of the evil owner Holt interfering with basketball operations. I would honestly find a lot more to agree with MB if his completely baseless hatred of Holt was tempered a bit, and if he had the maturity to realize that those who happen to support the Spurs during some questionable moves (such as not re-signing Brown) don't necessarily "like Holt's nuts". Or some other equitable comment