Arnie, you're so right. Regardless of all of the search warrants, it all boils down to motive. It's up to LE to make sure that every single piece of evidence obtained is done so legally and no stone is left unturned.
DP has already said that there is no motive for DM to be involved in such a crime. A family with money, success and no brushes with the law.
Right after visiting DM on May 17, DP say's DM is
"Very shaken up, very concerned,
wondering how one ends up in a situation like this"
http://www.cbc.ca/player/News/Canada/Hamilton/ID/2385605761/
DP is also on record saying that DM had a close relationship with WM. In discussing WM's suicide DP said ""We're confident that is exactly what it was," he said, adding Millard had a
"very, very close, tight relationship" with his father."
http://www.huffingtonpost.ca/2013/05/21/dellen-millard-lawyer-deepak-paradkar_n_3313595.html
DM apparently had a close, tight relationship with WM. DM had ton's of money and a regular girlfriend. So, the question really is "why" would DM kill TB or anyone for that matter? If DM is responsible for WM and LB-it could be argued they were crimes of passion, self defense or something-he knew them and had a relationship with them, maybe something happened, but with TB? Why drive 50 km to steal a truck and kill a stranger, especially after you've met his wife and can obviously see that whatever you're about to do is going to cause insurmountable grief on this man's family? IMO, that's a total disconnect and puts DM into a different category that doesn't need a motive: psychopath. JMHO
"The following are environmental factors, psychiatrists say, which create a sociopath:
Studies show that 60% of psychopathic individuals had lost a parent;
Child is deprived of love or nurturing; parents are detached or absent;
Inconsistent discipline: if father is stern and mother is soft, child learns to hate authority and manipulate mother;
Hypocritical parents who privately belittle the child while publicly presenting the image of a "happy family"."
http://www.trutv.com/library/crime/serial_killers/notorious/tick/psych_6.html