Romulus Prime wrote:

Ridiculous on this level alone...oh wait, it's only half ridiculous since he murdered the Senate.
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Oh wait... it's not ridiculous since Senator Tal'Aura murdered the Senate with a miniature Thalaron device and the Romulan military was following him. Like I said, he had to cultivate alliances within the Romulan government.
Romulus Prime wrote:

You don't know too much about Romulans I take it?
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They're TV villains there to serve the story, not the other way around.
Romulus Prime wrote:

There general mistrust of others is the norm for the majority. The MO of the Tal Shiar is that x10, expecting it as a given from everyone. There's just no way they would ever be complacent with slaves, let alone a clone who's rallying them.
No.
Fucking.
Way.
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They were never presented with someone who promised them the Federation. Sometimes people will contemplate unholy alliances if it gives them what they want. Who knows, the Tal-Shiar may have had plans to eliminate Shinzon once he delivered them a victory over the Federation.
Not to mention the fact that they were embarrassed badly by the Dominion and may have lost quite a bit of political capital after their blunders.
Romulus Prime wrote:

And no one ever suspects he might do anything with the "man"power and weapons he has? 100% trust and no questions asked? PLEASE.
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There is no indication that anyone has '100% trust' in Shinzon, they're simply following his flag to get what they want.