1)There was no conspiracy. Just a string of mistakes leading up to a very bad day for the ship.
2)Nobody would have a motive for doing as you suggest and every reason to avoid such like the plague. As Daniel pointed out, the ship was underinsured. Also, killing 1500 of your own passengers and crew makes for really
bad pubilicity which hurts future trade.
3)Follow the chain of events and what you find is that the bridge did recieve some ice warnings and steered a course further south in an attempt to avoid the ice that was actually reported.
4)Binoculars are actually not that useful on a lookout for anything save identifying a target once you know something is out there. They're virtually useless for searching. Having stood low visibility lookout watches myself, I don't have to guess at this. I
know from personal experience.
5)There were no explosions on the ship during the sinking, although I recall a few people thought so. What they
actually heard was the noise of the ship breaking up just befor the final plunge, then later, three destinct implosions as air filled compartments in the stern section caved in under the increasing water pressure.
6)Conspiracy theories may be fun to dabble with, and some people think that espousing them makes them look like the learned intellectuals who are
really "in the know." Nothing could be further from the truth and none of these hysterical tales last long when run past people who actually know what they're talking about.
If you want to read the testimonys for yourself and the reports of two different investigating bodies, click on
The Titanic Inquiry Project
If you want to get into detail on the actual forensics of the sinking, go
HERE.