Platies don't need to be in groups, not like tetras, as it goes. Like most non-shoaling fish, they quite like some company, but it's not necessary, and certainly not to go into an overstocked tank. If "for all you knew it was bad", then you could, indeed should, have asked the forum. That's what it's for.
You'll have to make your own decision. We have given you advice based on what we believe would be right for the fish. Various people have advised that you are overstocked, and that both species of tetra are unsuitable for a 10gallon tank, but you've rejected that advice out of hand. We're not going to give you bad advice just because it's what you want to hear.
You're very young, as you mature you'll realise that sometimes you have to make hard decisions. Your decision is (A) do the right thing, or (B) do the thing that you want to do. I sympathise with you, it isn't easy. My last suggestion to you is to stop trying to over-analyse this. Stop thinking about the what-if scenarios. Do what you feel is right for you.
You'll have to make your own decision. We have given you advice based on what we believe would be right for the fish. Various people have advised that you are overstocked, and that both species of tetra are unsuitable for a 10gallon tank, but you've rejected that advice out of hand. We're not going to give you bad advice just because it's what you want to hear.
You're very young, as you mature you'll realise that sometimes you have to make hard decisions. Your decision is (A) do the right thing, or (B) do the thing that you want to do. I sympathise with you, it isn't easy. My last suggestion to you is to stop trying to over-analyse this. Stop thinking about the what-if scenarios. Do what you feel is right for you.