Worf was the chief of security, it's his job to suggest the more aggressive or defensive strategy or to urge greater caution, even if that might not ultimately be the right thing to do. That way when others suggest a more passive or diplomatic approach the Captain can weigh the options and settle on the one he feels is correct, or create a compromise strategy of his own that lies somewhere in the middle.
It's this concept that often makes me wonder if the job of tactical officer & security chief aren't in some ways at odds with one another. I agree. As security chief, it's sensible to have him offer suggestions that err on the side of precautionary, even to a fault, such that the captain can come to some balanced judgements, on the whole. Likewise, the tactical officer should be thinking in terms of attack , and being on the offensive, which might not always be the best course of action either, but that's what they're there for. In this relationship, shouldn't the security chief actually need to argue/debate with the tactical officer at times? If the idea is to have people in positions which represent an aspect of potential strategies, then why would you ever think to combine these two exceedingly polarized ones into one assignment? Even a stupid American football team has offensive & defensive coordinators
I just started TNG, but I've noticed that his reactions can be violent and his solutions are usually shot down at this point. I just figured this was due to him being a Klingon. I do wonder, though, if his character develops into one that doesn't automatically resort to violence?
By the time DS9 rolls around, I think Worf has tempered his violence with cunning strategy and forebearance. He still fought, but more as a last resort. For example, look how long he took trying to figure out a way to avoid a shootout (while the Defiant was under fire) in the Paradise Lost two-parter. He ended up fighting there, but he obviously did it as a last resort with no other apparent options.
