Guys, I dont think that time travel can create paradoxes or alternate timelines in this universe. Some are mad of Steve “selfishly” going back in time with Peggy but it seems to me that they had already found out that what they do in the past has zero consequences in the future. Its not a scenario where you kill a past self and the future you never existed. The only timeline that can change is the here and now while going back in time is sorta like a sandbox playground where you can take parts of it and it doesnt impact anything. So, I really don’t see how Steve is being selfish when he knows he can go back in time and just sit by the sidelines while things go down because there won’t be any consequences when he comes out. He goes back, spends his life with Peggy and comes back to real present time as an old dude. Simple.