We didn't simply "announce" one day that we were taking over. Rather, we assumed control of the Philippines from the Spanish. We also then later, during WWII, redeemed the Philippines from the hated Japanese.
Our stewardship of the Philippines was prudent and beneficial.
There was even a sizable native movement to achieve full statehood within the United States.
Regards,
McKinley made the decision to annex after the war with Spain. He could have announced that he was going to give them independence after a transitional period, as we did with Cuba. Plenty of Filipinos had been expecting independence, so we were fighting them for three more years.
Filipino-American relations became warmer over the years, especially after the Japanese occupation, but at the time many both here and in the Philippines felt that we did stab them in the back.