"I might have eaten a ton of ice cream today, but I had a lot of protein so that'll make up for it")

There is another one. In the end, you can see proteins as just another form of calories; if you don't exercise them off, a overabundance of them becomes fat. Proteins are not generally healthy or make muscles just like that.
And btw, eggs are the best protein source. While of oats it's still around 10% accessible.