Scientists Lack of Responsibility

With the possiblity of life re assesed in our solar system to being more probably one must stop to think of the ramifications of cross planet contamination as I am going to call it. We are sending a space craft to distant places in the solar system like mars and the moon Titan and other hot spots for life. And we could perhaps bring many potententially dangerous lifeforms to earth (bacteria most likely). However I believe we have a screening process to attempt to determine weather or not that has happened and they try to decontaminate the spacecraft upon return that is if it does return to earth at all. However, what about the places we send space craft? Did we ever stop to think that maybe we are sending infected space craft to other planets and we may wipe out the life that may or may not be there? I dunno, but I think scientists don't research things before they attempt to do them, thats my biggest annoyance with them. If they can do it alot of times its done before any ask should we. Take for instance the release of mongoose (or ferret i forget) (the one that eats snakes) to control the snake population in hawaii. It turned out there were hardly any snakes there in the first place, and then they had to many mongoose/ferrets... So what do they do? Introduce another animal the cat. To kill the mongoose/ferrets... Gee did this tactic work before? Now they have an overubandance of cats. Well DUH! This has happened many times before with many different animals in many different places. Thats only one example. Another is the A-Bomb they didn't even know the after affects of the radiation and the nuclear winter and whatever they just deployed it on thousands to millions of innocent people. Sorry sometimes I get sidetracked, but the point is I think before we start sending space craft willy nilly into potential life rich places we should do the research and see if we can discover what we are dealing with. Before we just rush blindly on the surface and discover that OH HEY. Maybe there is stuff here after all but we killed it. Or even maybe some aliens that dont like us dumping our trash in their back yard and get royally pissed off. HAHA. Who knows. Until next time... BEAM ME UP SCOTTY! (err thats the oldest one in the book bob) (I know that, but sometimes oldies are goodies!)