Are some of the sentences being handed out to UK rioters too severe or does the fact the crimes were committed during the riots justify the stiffer sentences?

some examples are:

Nicolas Robinson, 23, of Borough, south-east London, who pleaded guilty and was jailed for six months for burglary. He took a £3.50 case of water from Lidl supermarket. He had no relevant previous convictions.

David Beswick got 18 months in prison following a guilty plea to handling stolen goods. Beswick was given a flat screen television to put in his car and had no previous convictions for offences of dishonesty.

Jordan Blackshaw, 21, of Marston, and Perry Sutcliffe-Keenan, 22, of Warrington, were jailed for four years each after admitting using Facebook to incite disorder, although none actually resulted.

In normal times these offences would be highly unlikely to result in prison time. Are the harsher sentences justified due to the crimes taking place during wider disorder or are the Judges unfairly treating these people to satisfy political and public opinion?