Being aggressive can be a big benefit in business. However I have seen people be aggressive at the wrong time or to the wrong people and it can go all wrong. I believe the key is to pick your battles and of course try the old standby of counting to 10.
I have had the privileged of working with some people who have spent time making me understand the when and where.
Next time you feel the pressure to get aggressive and go for the "kill" you may be best suited to take your time and make absolutely sure you are making a wise choice.