With enough cash it is possible to keep everyone happy, although you need to watch out for UFOs on Infiltration missions - the UFO will hover over a building and you can see a grey tube connecting the craft to the building. You'll need to investigate those buildings ASAP, otherwise the owners can get brainsucked and then they'll always be hostile to you.
"Commander, aliens tried to infiltrate the EvoNet, we fired a Retribution missile at their building as ordered, it worked but the EvoNet is angry at us now!"
"How much to change their friend status to LOVE again?"
"About five million dollars!"
"Tell the team to gear up. We need to raid the Sirius temple three or four times more today."
"We have hit these guys like thirty times this week, and it's only Thursday... Maybe we should raid Diablo for a change?"
"Not sure what political impact it would have and I don't feel like thinking. Sirius temple."
"Aye sir."
"...You know what..."
"Yes?"
"On Sunday, we'll raid the Senate."
"Sir, but that would cost us..."
"...About five more raids on the Sirius temple, yeah. Definitely worth it."
PART2
"We need money to pimp up my Hawk."
"I'm ordering the crew to crafts to raid the Sirius temple right away!"
"Wait. I got tired with shooting down their endless supply of fighters. I wonder whom they're raiding to afford trans-dimensional hangars... anyway, from today on, we'll be using public transport."
PART3
"I think our money vault is a little bit empty."
"What are you saying Commander? We have..."
"Not enough for me, and the whole crew, and our scientists and engineers, and hookers, to use it as a swimming pool."
"...we raid the Sirius temple, I know."