transactions – Is Segwit really safe and reduced?

In the Segwit rules, transactions propagated to legacy node doesn’t have any signature. so it will be valid as well as in terms of fresh node(supporting Segwit).

First question:

In this point, if Bob make a fraud transaction with Segwit, legacy
node will accept, but it is not accepted in terms of fresh node. so,
some group(legacy nodes) accept, other some groups(fresh nodes)
doesn’t accept. it means that proportion of fresh node should be
bigger than proportion of legacy node. I think that this is really
critical issue but current Bitcoin works well. we can say proportion
of fresh node is bigger than legacy groups, but how it was achieved?
when Segwit is appeared, at this time proportion of fresh node is
maybe too small to overtake legacy groups.

Last question:

Block size is physically 1MB. Regardless of the calculation rule is
‘Weight’ or ‘Bytes’, the transaction size is always same physically.
Why some guys says that Segwit transaction is compact than traditional
Signatures are not removed, it is just moved to end of the transaction. Consquently, the data size are same between Segwith and traditional protocol. Please catch where I am wrong.

Sorry for my English.

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