You're right, I assassinated 2 Senate characters and nothing happened except a dip in my popularity. I haven't noticed this before as I've never played as a Roman faction.
There is a way around this however, as you could use a basic short script to trigger a civil war. If you haven't tried scripting yet read this excellent tutorial:
https://forums.totalwar.org/vb/showthread.php?t=46738
Once you have created your first short script you can open it and replace the contents with something like this:
script
console_command diplomatic_stance romans_julii romans_brutii war
console_command diplomatic_stance romans_julii romans_scipii war
console_command diplomatic_stance romans_julii romans_senate war
console_command diplomatic_stance romans_brutii romans_julii war
console_command diplomatic_stance romans_brutii romans_scipii war
console_command diplomatic_stance romans_brutii romans_senate war
console_command diplomatic_stance romans_scipii romans_julii war
console_command diplomatic_stance romans_scipii romans_brutii war
console_command diplomatic_stance romans_scipii romans_senate war
console_command diplomatic_stance romans_senate romans_julii war
console_command diplomatic_stance romans_senate romans_brutii war
console_command diplomatic_stance romans_senate romans_scipii war
end_script
I tried this script yesterday, it does work and also brings up the 'outlawed by senate' message. The downside is you have to trigger it yourself.
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